They have in-app ads like this: https://cs.joshstrange.com/zTpdlC (Note: dismissing this does next to nothing, it's back almost every day or at least as often as Zoom restarts)

And then post-meeting popup ads (that are always on top until you dismiss them) like this: https://cs.joshstrange.com/BizVwE

I've gone through almost all the settings I could think of but I don't see a way to disable it. I pay monthly for Zoom and I'm logged into that account. I find it beyond the pale that Zoom wastes my time/energy in this way especially since most ads are about a product I will never use. If I need a tool to run a 500+ person webinar my life has taken a horrible turn, and if I did I wouldn't use Zoom since they do crap like this.