InDeath isn’t even an exclusive; besides, not everything‘s Meta‘s fault. The vast majority of games aren’t "forced" to only be on Quest, that’s just the biggest market and Studios have to decide where they want to focus their limited time and energy.
In Death (not Unchained) is abandoned on Steam. So much so, in fact, that it crashes when you launch it because the leaderboards were shut down. You have to go into your firewall and create a role to deny the Internet from the game in order for it to launch.