The Boost android client for Lemmy is displaying these dark pattern ads pretending to be system notifications. What security/privacy conscious Lemmy clients do you recommend?

I didn't make the statement that it's their property, I made the statement that it's being displayed through their application.

Boost loads adds from a shitty network though. Most open source apps don't do this stuff because nobody wants a Lemmy client to load ads; users only ever tolerate it in return for a more polished UI or whatever.