Given how big zinga is, it'#s a good bet that feature loses less players than it keeps. Otherwise they wouldn't do it.
I'm just trying to get firebase working now for events but it takes ages to update the online stats.
UPDATE: Got firebase custom events working! This is awesome, now I'll know what level my players get to, what control methods they use, whether they check the achivements, the high scores, options, everything! This is brilliant! I'm reading a book called "Free-to-play" right now (
https://www.amazon.co.uk/Free-Play-...ds=free+to+play&qid=1580939215&s=books&sr=1-2) , which is why I'm so into this, I think I can increase my income a lot by following the advice it gives.