Can't help wondering if Zipo Apps just got scammed here?
Sell your GPL licensed codebase to a company, donate that money to a charity or whatever, make a fork, and convince everyone to move over to that version. Everyone's inconvenienced for a bit, but otherwise it's business as usual.
They're almost certainly buying them for the brand name, market penetration and high Google Play reputation. But I imagine anyone willing to replace the default Google apps isn't going to put up with a new privacy policy and/or ads.