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I think to say the least, this is an overreaction, and you don't need to be concerned at all
Mr. Unaware. These changes only apply if you make 200K per year AND have 200K installs from your game. For an adult/porn game it's nearly impossible to make that kind of money so you can keep using Unity as you currently do without any changes required. Even if you have 200K public version installs, you still don't have to pay them a penny because you aren't profiting enough and way below the threshold.
Taken directly from their
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" Please note: It is important to remember that games that do not reach the revenue threshold, including games that are not monetized in any way, are not required to pay the per-install fee. "
They're targeting mobile games and predatory F2P games that make millions off the back of Unity using advertisements, and they don't see that money coming back to them. These companies show losses and other accounting tomfoolery to get away with paying as little as possible to them so by tracking and charging for installs, they can still get a piece of the pie.
Regardless, there's likely going to be an insane backlash and legal cases soon from Microsoft, Sony and Nintendo because according to Unity, these companies are liable to pay for the installs and not the developer (like using xbox's game pass or sony's subscription). After that, I'm pretty sure they will either revert these changes or delay them indefinitely.