itch.io

Also, I have contacted support about this in the past and they say they don't block people even with evidence of these malpractices. Itch.io doesn't care. 

Yes. You can do that on Gumroad, Subscribestar and Patreon. They all allow you to block people from purchasing from you. In gumroad you don't even need a purchase before blocking someone, all they require is their email and anyone with that email won't be able to purchase your products. 

The site could block their PayPal or credit card. 

It's crazy to see a site as big as itch.io lacks on the most basic privacy and protection services for creators. 

If a creator knows of a person that is known for fraud and doing chargebacks on purpose, they should be able to block them off their project pages. If a creators knows of a known leaker or realizes their game got immediately pirated after release, knowing full well the 1 person that got it is the leaker, they should be able to ban them and block them from purchasing future projects. 

Yet this is not the case. 

If Itch.io cared about protecting their creators, these features would be implemented. Hell, Gumroad even fights the chargebacks cases of their creators for them by default. 

I realize the staff of itch.io is stubborn on not wanting to give a good service to creators, but it would be nice to see such a basic feature implemented. Apparently you can block people in most social media sites yet here you are on your own.