I've noticed overall that 10 minute mail emails don't work the way they used to 10 or even 5 years ago. Sometimes the confirmation email doesn't come in at all, but if I use one of my Gmail accounts it comes immediately. Many systems have a fraud score or system that ranks or rates email domains that look to be computer generated or simply are not email addresses a normal person will use (Gmail, Outlook, Hotmail, etc). Gmail email addresses seem to be the golden ticket since, unless your country mandates that companies can't do this, Google almost always will require you to 2FA with a phone when trying to setup an account. I'm noticing more companies actually blocking outlook.com email addresses more often, or at least flagging them as being potential bots.
I was in Europe within the past year and I made a handful of Gmail accounts to use since demanding a phone number from users is basically prohibited. When I tried to access the accounts once I got back to the US, I was told that my accounts did not exist. I should have tried logging in with a VPN first, but even then most sites know when you're using an IP address or range belonging to a VPN and then make you jump through more hoops.
I've basically conceded and whenever I want to fuck around I just throw a cheap SIM card into an old phone to 2FA. Ting used to be a few bucks a month for a phone line, I think they charge closer to $9 now. Just be sure to setup account recovery with that email account before you lose the phone number. And YES you need an actual phone number, you can't just use Twillio's API to just 2FA a bunch of accounts, there's some sort of way to tell if the number submitted at registration is a legit phone number.
As for Reddit, they absolutely know all of your alts. So if you've ever been banned or shadowbanned outright by Reddit, you're on their shitlist and they will ban your alts immediately as well. I have a friend who keeps getting banned on his alts. His wife tried using the site during Covid and deleted her account and app after a few months because she couldn't stand Redditors - so they haven't tried edge testing using the same IP address with different devices.
Years ago I got a DM from Reddit telling me to stop voting on my own posts from alts because they know what I'm doing and if I do it again I'll be banned. (I was posting links to something I sell.) I ended up just paying a few bucks for Soar and Signals to upvote my content and I've never once had a problem and I always get a return on investment.
I think Reddit uses the Reddit cookie to track you, on top of tracking your IP and maybe even taking a device fingerprint. Here's all the info you get if you ask for a data export:
Most of the CSVs are empty BTW, and the linked account CSV is empty as well in this case despite this being an export for one of my alts. Email address is logged in the Statistics file. The IP address CSV only seems to have the last four months of activity since the export despite the account being years old, as well as the IP address that was initally used to register.
Likely if you're registered with a 10 minute mail account on TOR, you're flagged as an asshole. If I wanted to create a Reddit alt account right now I'd register with a Gmail account and use my cellphone's hotspot to have a different IP address. (I'd love to find a VPN that doesn't require me to prove I'm human on every website I go to because none of them trust me.)
Someone more nerdy than me can correct me on this but it's my understanding that it's harder for a website to uniquely identify you when you're connected over 5G or 4G versus your IP address from your router at home. And since so many people mainly use their phones for everything today, websites completely overlook this. Yes, the police and your ISP can uniquely identify you this way, don't be a fucking retard.
Anyways, I believe that if anyone ever leaked what everyone's alts were it would kill the site. Anyone on that site long enough basically always has a porn alt and more. People you can easily doxx by their main account would instantly be linked to all of the nudes, porn, and shitty opinions that they otherwise would not share in their waking life.
Hope this helps.
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