I don't see the legal issue? You make art, not porn.
tell that to patreon...
also, in some countries (australia, for example), the line between art and porn is extremely hazy. we have a system similar to patreon which relies on what the art "looks" like and many things can be defined as "porn" depending on their purpose/intent of the user. it's a very open definition which allows for cryptic interpretation.
but for that legal decision (had it been made) it would have crippled the industry not because of the definition of porn, but the fact no company could reasonably maintain the level of customer service required to implement the demands (ie: 24 hour reviews on disputed content). given the number of complaints such a decision would open itself up to, it'd kill a lot of the erotic industry overnight, as many companies would simply refuse to host many kinds of content simply to avoid the associated costs of dealing with it.
overall, it's a continuously nebulous grey area... one i feel a little passionate about because i personally feel erotica/sexuality of any kind is a personal thing and, so long as nobody is being actively harmed, what does it matter if someone wants to play an incest game made of 3d or 2d art?
the argument that it might offend someone who randomly stumbles upon it is absurd to me, given i get offended every time someone posts a jesus comment on twitter. and some fetishes really do make me personally cringe or think "wtf"? if you don't like something you see on the internet, it's pretty easy to close your browser tab, or click another link. there's no need to demand that content's removal.
that's just me, and i know i'm preaching to the choir as you clearly think the same.
but, there you go. i'm tired and grumpy about patreon/legal oversight today. i'll stop now.