I saw it mentioned in this Cory Doctorow article a week or two back about some of his issues with bluesky, but he mentions here that the cost has came down from tens of millions a year down to tens of dollars a month

Hadn't heard of wafrn until seeing it on f-droid this morning but I might give it a try, a tumblr-like platform would be nice since tumblr seems to have given up on using ActivityPub.