The vast majority of Patreon's user base (the artists getting patronage) are not producing anything that would get booted off of Patreon for. In order to compete, bitPatreon and SubscribeStar will have to compete on attracting Patreon's artists off Patreon.
(FTR, I'm mildly certain that many artists on Patreon might even find the policing of the Patreon platform to be a positive, because it means their name isn't associated with the names of people they find reprehensible. I'm concerned that alternatives such as bitPatreon and SubscribeStar will quickly gain the reputation of being a platform for people whose beliefs are considered reprehensible elsewhere, which automatically makes it difficult to market those alternatives.)
(FTR, I'm mildly certain that many artists on Patreon might even find the policing of the Patreon platform to be a positive, because it means their name isn't associated with the names of people they find reprehensible. I'm concerned that alternatives such as bitPatreon and SubscribeStar will quickly gain the reputation of being a platform for people whose beliefs are considered reprehensible elsewhere, which automatically makes it difficult to market those alternatives.)