Lidarr is still very much supported and the issue is being actively worked. The only people bitching about it are entitled users who demand the free software be fixed and maintained on their schedules instead of that of the volunteer devs who have lives of their own.

I don't use Lidarr, but I've read that the team has been having issues over the past few weeks with its metadata server, which can't be run locally (as of right now, anyway) and is required for parsing and fetching metadata. So, essentially, the auto-tagging and search systems are non-functional.

I think it's only supposed to be temporary, but I'm sure it's been frustrating a lot of users and I've seen that some people are switching to alternatives or just downloading/tagging songs manually again.

for non-audio e-books I always find everything on zlib