As part of the devs farewell message on their site, they have included malicious code to make each visitor sends 2,000 requests to the dbzer0 servers in an attempt to DDOS and take the instance offline.
Tesseract is an android app people could use to connect to lemmy. For some reason, the dev had several instances, words and users completely blocked within the code, without letting the person who downloaded even know about it, much less disable the blocks. One of the things it blocked were "mod abuse" communities.
As expected, things exploded once it was made public. No problem in having personal biases, everyone has them, but shipping an app with those biases baked in and hidden from the user is a shitty thing to do.