As if I needed any more reasons to be making the switch away from Gmail, it turns out they also track and every single search you make within Gmail itself. Recent searches include looking for a receipt, an email address, etc. It also logs ‘viewed Gmail ads’; I never actually click, them, I just delete them so they’re out of my way. Evidently that’s what counts as a view and is then tracked, so it’s time I stopped doing that now.
I found this simply by going to my Gmail account settings, clicking on ‘Data & personalization’, and then click on ‘My Activity’ under the ‘Activity and timeline’ box. I can think of no valid reason this should be saved, even if it’s ostensibly “Oh, I forgot what I was looking at earlier, let me check.” I don’t do that, and can’t say I know anyone else who actually does either.