One position required me to take a psychoanalytical test where they judge your personality traits to A.) make sure you have the desired personality traits for the role and B.) that you're smart enough for the role. I looked at the terms of service for the company they outsourced this test to, and it seemed like a data breach waiting to happen. I expressed my concern to the HR team in charge of hiring, and said I wouldn't feel comfortable having that kind of deeply personal info shared. I further expressed surprise that an open-source software company was using this test at all, given the usual penchant for data privacy in the FLOSS community. They (cordially) said I could either take the test or drop out-- I chose the latter.
For the other role, the interview process was going well, and I made it to final round. But, I ran when I saw their tech stack and tech debt. Lots of Jenkins and heavy reliance on Launchpad for almost everything. Launchpad might not technically be proprietary since it's GNU-licensed, but it's as good as proprietary if Canonical is one of the few companies using it commercially. And Jenkins is just Java / Groovy garbage all the way down.
It also struck me as a red flag that Canonical is 100% BYOD (Bring Your Own Device), and they do not provide a work computer. You can apply for a _loan_ to buy a computer for work, but they will not pay for one. If a company is too cheap to provide a computer at a job where you work remotely and exclusively on a computer, I don't want to be a part of that company.
Lastly, I read a lot of negative press about Canonical's CEO Mark Shuttleworth while researching the company. In general, Canonical seems like a sketchy place to work.