I built a custom platform for joinmastodon.org sponsorships on the gold/platinum tiers (those are the ones that get a medium-sized logo/link on joinmastodon.org) using Stripe.
I don't think the Patreon tiers are going anywhere but this alternative method has some advantages over Patreon for both parties. (I'll go into more detail in a follow-up post)
The billing cycle isn't bound to the 1st of the month, so you have no risk of being double-charged if you pledge near the end of the month; if you're a business in the EU you can use your VAT number to not get charged VAT; there's an annual billing option with a 10% discount; uploading your logo is more straightforward than having to message or e-mail me. And on my side, Stripe takes far less in fees than Patreon (~2.5% vs 10%).