That thread is full of FUD (Fear, Uncertainty and Doubt) over an incident from 2015 when there was an integration (now removed, in a desktop environment that is no longer used) that would allow you to search amazon store from your desktop. Ubuntu is just as trustworthy as any other major linux distro.

@apple-muncy This theory was highlighted in a recent Lunduke Hour video. https://www.youtube.com/watch?v=YQ-EZIgioSg [ 59 minutes - Standard YouTube Licence ]