It's Damus's monthly subscription. It's mostly for supporting the Damus team.

Paid membership to Damus that gives extra features and helps fund the project

Monthly or yearly sub

Won’t do it because I hate subs

Now if only nostr:npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s did a one time payment.

I would actually consider it.