They are definitely going to have some problems with Rockstar's legal team if they don't back down on some of their asset usage. In the trailer on their Patreon site, at around 45 seconds in you can see three cars in a garage that are literally ripped directly from GTA:Online. From right to left:
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,
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, and
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. I would assume the yellow one on the far left is also ripped from GTA:O, in fact it looks like the
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but it's harder to tell because it isn't fully in frame.
I play a *lot* of GTA:Online so I recognized these vehicles immediately. I have zero doubt that other people will also, and if one wrong person reports that to R* then the project is in hot water.
Don't get me wrong, I want a quality GTA-style porn game as much as everyone else and this looks really promising, but if they're using stolen assets the project won't get far at all.