Cancel Lemmy is a community on piefed which has the goal of being a space where people can discuss moving away from Lemmy, alternatives to Lemmy, and just general problems with Lemmy as a software and ecosystem. People are even free to discuss problems with the current management of Lemmy. If you have grievances or wish that more servers would just move on from Lemmy this is the community for you.
Speaking for myself, while I’m not really happy about some of the political baggage associated with the lemmy dev team, and I would be interested in participating in discussion about non-lemmy server alternatives, I don’t really want to jump into something named quite as adversarially as “cancel_lemmy”.
That’s not to say that there isn’t potentially demand for and interest in this. It just crosses the line into getting more political on the matter than I’d like to be. But I would like to point out that it may be that there are other people who feel the same way, and might exclude some users who would otherwise participate.
EDIT: I’d also point out that while it’s not specifically directed to discussion of the Lemmy software package, !MeanwhileOnGrad@sh.itjust.works has a fair bit of discussion among people who are unhappy about the political side of the lemmy.ml, lemmygrad.ml, and hexbear.net instances and want to discuss that.