I think this may be one of the very first examples of a website operator being open about operating a miner in the background. As long as its balanced in nature, and as long as you've informed users and keep things relatively open it's a really good method to fund the servers for the site.
Most of the websites seem to have just plopped it on and let it run at 100% CPU which people tend to notice straight away, by having it a bit balanced it means you're not annoying users too much and you're also opening up a way for the site to be funded without shitty ass advertisements (like thepiratebay uses)
The only issue I can foresee is from laptop users, because typically laptops have a lot more issues with higher CPU/temperatures. Perhaps you could add a toggle switch in their profile settings or something?
In any case, as long as I don't have something more pressing to do with my giant ass 16 core CPU I will gladly leave a tab open for this. It's also really nice that it doesn't double/triple up if you have more than one tab open.
If you could please keep us posted on how much this generates over the next few days/weeks it'd be great, it will also serve as very useful information for other fringe website operators. For the sake of other website operators etc I'd ask that you include things like hashrate averages and the number of users (we all have autism so don't cut down on da details plz)
The fact people have willingly disabled adblock for this is a really interesting part of it.
This is what my taskmgr looks like at the moment: