It really depends on what you're asking for. If you mean early access you'd need a lot more than 1000 subs, especially if it's AAA games. AAA developers usually try to keep a tight lid on their stuff as much as they can for as long as they can but this depends on developers. Indie developers are usually meh about but similar situation. I haven't really seen any lower subbed YouTubers get early access to games.
If you're talking free games than you're an idiot if you're going to ask them lol I'm just gonna say it outright, sorry. If developers want, they will contact you. Although at around 1000 subs I'd probably recommend opening a business email and leaving it in your about section because you'll start getting noticed a little more, well that's my plans for when I hit 1000 anyways. Eventually when you get bigger they might even invite you to their studios and things like that. But yeah, don't ask for free games otherwise you'll be like a beggar.