Game testers are made to sign really strict NDA's where they're probably not even allowed to mention what game their testing. Even stating your under NDA can be a violation of the NDA.
I'm an ex-tester. True, the NDA's are insane. There's usually always a clause, in the ones I signed anyway, which state you're not allowed to work for another studio until 6 months after you leave. It's never been enforced and everyone ignores it, but it's there. They do it to protect the IP so you can't take ideas to another company. Lots of crazy stuff like that.
There are sections saying you're not allowed to (phrasing?) disclose details of the project. It's not strict. You're allowed to talk about games you're working on so long as they've already been publicly announced. Obviously only details which have been released and legitimately confirmed. Which is nearly nothing, even when half a dozen trailers have been put out. I never did and never met anyone who did, can't imagine the amount of harrassment you'd get for the smallest of useless outdated information. Might still have a contract or 2 laying around in storage...
There's very much a pecking order too. The public are second from bottom. Everywhere I worked, we hated the public. Detested them. Avoided at all times. From their worthless opinions, to their endless complaining over every single feature and stupid repetitive service desk tickets twe have to respond to. How about instead of giving a game 0 stars because it doesn't work on your 1 machine, out of the 2 million copies sold, you just die. Fix verified! The only people worse are journalists. They're incompetent, uneducated, petty, vile, lying scum, after any freebies they can get for a good review... and still give you a bad review. Remember it's not dev teams who ask for your opinions, it's marketing teams running community engagement programs. The public are stupid, they'll buy whatever we make <insert _every_game_name_here> even if it gets mediocre reviews.
Working in the games industry makes you a very angry person. Not a 10 year old throwing controllers angry, legitimate ripping open your lower torso and punching your insides angry.
Pro-tip: If you know someone's studio E-mail address and want some inside information, E-mail them during the Christmas or summer periods. The stupider people put their project codenames, actual project names and contact details of other studio employees in the out of office responses. I've even known someone to put milestone dates in theirs. What a derp. Works particularly well on managers and producers. Actual employees don't even bother with OOO mails, mostly because we're never out of the office.