To ban, you go to your patron list
Left sidebar > patrons > “View all current patrons” button > and then you find whom you want to ban, and there’s two ways to ban.
check the box on the left of their name and at the top the ban option will show up (can only do this with one person checked. If you check more than once you cannot mass ban and the option will dissapear. Which imo is a pain.)
Click their name and go to their page. Under their user information there will be a button/icon for more options and on will be to block them.
As for figuring out who to block, its different for everyone and getting harder. Usually its a new account, weird names, icons that don’t match up to their names, weird businesses, etc. I make sure i go and check all of their accounts to see if they have any successful pledges.
Lots of people also send notes and give people 24-48 hours to respond to confirm they are real and then they remove them. The issue is that if they are taking content, they’ve done it within minutes of pledging, likely. (most are bots these days.)
To prevent people from stealing my work, i post low res in the blog and private message all paid patrons the finished/high res content. NOW, I’m cropping the low res versions and DMing people the full previews because there’s a site that is stealing my private content, including low res, and i’ve just hit the point where my patrons and I agree that since early access is a big part of their rewards, I’m going to put extra effort into keeping those things private just to them.
Hopefully that helps!