You cant have incest with your cousin, sister, mother or granny Flo. It is an illusion propagated by Patroen. If you are both adult there is no incest but if there is off spring from a blood related couple then there is talk of an incestuous relationship.
that is quite simply not true. you seem to be confusing incest and pedophelia.
any blood tie down to 2nd, in some cultures 3rd degree of relation is incest. in some states it can be legal under specific circumstances (that is, 2nd and third degree, never 1st degree)... but it still remains incest. Age has nothing at all to do with it.
this is not up for debate either. I advise you google it, check on wikipedia or any legal text from most developed countries, including yours. and no.. patreon is merely sticking to the law relevant to the US.. it doesn't have an "agenda".. keep the conspiracy lunacy out of this, please.
that said, I personally have nothing against it per se, but let's not delude ourselves about what is real and what is wishful thinking.