the reason roblox won’t implement something like this is simple: it opposes playerbase growth. every guest or new player that plays your game is a potential customer who might buy robux, bc, roblox cards, etc. yes, they might be a hacker, but roblox would rather take that chance than lose a potential customer.
Encountering exploiters is also a negative experience for a first-time player. Your game can’t be a “negative experience” for first-time players if they can’t see it. Roblox already filters the game page for platform, they could probably do it for account age as well, especially considering it is formatted differently for new accounts.
The limiting factor here is if Roblox wants to do it.
The problem is that your game is exploitable, so preventing new accounts from playing your game is just a band-aid solution. The proper solution is to fix your game.
I understand that it’s a lot of work to convert your game to filtering enabled. I just went through the process with my own game and it took weeks. But ultimately this is what we want developers to do as it gives the best player experience possible.