Simple Mobile apps have been very popular among FOSS enthusiasts. I've personally been using the Gallery, Contacts and the Phone app since a few years now. It's a shame that it has come to this, will be on the lookout for their forks.
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That's a good point, although I wonder if there are any ad SDKs that are GPL compatible? There's no reason that couldn't exist AFAIK.
However, there's also the much simpler scenario where they straight up replace the apps with something completely different. This company buys apps all the time, so I'm sure they have at least a few calendar, gallery, file browser, etc apps lying around that they can reuse.
"we specialize in acquiring under-optimized apps in an industry that is highly fragmented. We use our optimizing operations, deploy its technology, and generate cash flow from the apps. "
"we developed an AI technology that knows how" "to monetize the right user at the right stage of their app experience"
(https://everything-pr.com/zipoapps-tech-talk-with-the-entrepreneur-co-founder-and-ceo-gal-avidor/)
Sounds like they just keep the apps around and try to squeeze as much money out of the users they have bought.