12.10 had Amazon Search baked in: https://www.eff.org/deeplinks/2012/10/privacy-ubuntu-1210-am...
17.04 and later have ads in the terminal greeting messages: https://news.softpedia.com/news/canonical-under-fire-for-put...
When even my healthcare websites contain Google tracking tags, it's getting harder to find _anything_ untainted by advertising companies, even after paying what I would consider a reasonable price for the service itself.