Personally, a few reasons.

• I don’t need to run 2 containers and >10GB. I could just install and run in 10 seconds.
• My whole library and metadata is self contained in a single dir. On a fresh OS install I could simply point Calibre to the dir, and off we go.
• A rich plugin ecosystem, including deDRM plugins.
• I can just ignore the AI stuff (for now, at least)
• I’ve used it for close to 2 decades. Familiarity is definitely a factor. And yes, it’s still as ugly as it was 20 years ago. But once you’ve set your workflow up, the UI just kinda melds to the background.

It is one of the ugliest, most complex to configure, pieces of software I’ve ever used. It’s also the best ebook management tool out there. I love Calibre.

I knew who it would be before opening the video. His whole thing is about making strange - and very often, unsafe - musical instruments. One of his early videos was replacing piano hammers with actual hammers.

His spinning guitar is actually super cool though!

They’ve fixed Truecrypt vulnerabilities uncovered by previous audits, and have themselves been audited at least twice

Edit: some highlights on the latest audits and their response.