Yup, and not just ads. At one of my jobs at a SECURITY company the bugs are considered a liability. Features were prioritised, vulnerabilities be damned.

After that experience I doubt most proprietary software is more secure than open source

A company I worked for has had such a bad experience with the Microsoft business suite that they actively avoid using any MS products at all costs. They started offboarding a year ago and they STILL haven't managed to get rid of everything