So if you're serious I think you can work on integrating user logins with a Patreon API that would effectively allow only users with permission to access that content, and lace this throughout your game code.
While it's a legit advice, it's also a bad one when it come to adult games.
Each day, there's dozen of new games or updates. And it's just for here, so it don't count the games that can't be here (online requirement, loli, IRL bestiality, lack of English version), or that are so low below the radar that uploaders/leakers don't know about them and no one requested them.
While having his game leaked here will not guaranty support and success, it provide the biggest exposure that a Western adult game can expect. What also mean that, for Western adult games, not having it featured here will serious limit the support and reduce the possibility to be successful.
Of course, once cracked it's not an issue, if it's of some interest the game will be present here. But there's a pitfall. If the security change with every update, the dev will looks like a jerk, and who would want to support a jerk?
Plus, like
Insomnimaniac Games said above, the time past to protect the game would be better used to actually works on the game.
By example, I remember one dev who, few years ago, said that he past two weeks to come to the protection for his Ren'Py game sources. I needed five minutes to revert the said protection. And the same would apply for most other game engines.
Implementing a protection, whatever it is, is a long process, but bypassing it just need to remove a branching, and possibly force a value to True. What mean that, for someone who know what he's doing, it will generally just be a question of minutes; a bit more if it's Godot or Unreal. Then, after the first time it will be even faster, even if the protection change with every update because you know what you're looking for and where to find it. The only parade being for the dev to also change/move all the part where the branching happen, what imply even more works for him, and still few minutes to bypass it.