I get it started, my favorite is Gridcoin. Been around since 2013 (same year as Eth). People asked “what if all that bitcoin mining power went to scientific research instead of hashes” and Gridcoin was the result. Never gets much love but it’s my favorite. !gridcoin
From my experience, it seems that any service that offers cryptocurrency payments seems to always set them up as a one time purchase that you manually must renew periodically. Is there any standard that exists, or is in the works that supports recurring payments to a service directly from a wallet?