Updated: 3/16/2024
I'll keep updating this list the more I learn about; only found three so far. I'll list if they do or don't use Stripe as a payment method so we'll see how it goes. PLEASE feel free to share sites/services you know of too and I'll add them to the list.
https://commiss.io/ (Uses Stripe)
https://itch.io/ (Uses Stripe)
https://sponsus.org/ (UK law based; uses Stripe)
https://artistree.io/ (Uses Stripe)
https://justfor.fans/ (Has announced they will be starting a subcategory for artists after the Gumroad situation. Stay tuned on their site for details.)
https://artconomy.com/ (Uses Stripe/lower risk as money is held in Escrow)