You can do it totally anonymously, you just need a server with docker that can't be linked to you. There are many ways (legal or not) to acquire such server, and afterwards it's simple.
Yes, instances are quaking in their boots that lemmy world might *checks notes* block two specific communities. Chilling to would-be pirates everywhere.
The lemmy code is free as in beer and free as in freedom, so you don't need to give any info to use it yourself.