G2Play Legit?

I believe that G2Play is just the same as G2A, in which case I have never bought from any of their websites. But I have read that it's a bit of a lottery, most keys work, but they are normally bought illegaly somehow so the games can be revoked from your account without warning.
I would say just pay a but extra and get whatever game you want from a legitimate seller.

They're one of those vaguely questionable grey-market reseller sites.
Selling keys from cheaper regional boxed games, reselling bundle keys, whatever.
It's reputable enough for such a site, and should state whether any restrictions apply, but it is still questionably grey-market.

Bought a few keys there a couple of years back, one was revoked later - they quickly provided anther that was legit.

Not.