C'mon they just update the break through lvl 100 system, don't complain much yet.
By the way I'm not whale but I have almost 2000 rainbow coin from yearly collect.
I got them from dupe girl and buy the cheap weekly deal.
Too bad I use all of them before yesterday live stream.

Also the only stage you really need to pay to win right now in my opinion is Whale-ship stage.
Developer dosen't force you to play it. So just ignore Whale-ship then you will be fine.

I think this will make a righteous for the DEV to bring back the guarantee gems gacha back.
Since player can use rainbow coin to trade for other thing than a rainbow girl, so maybe whale won't complain anymore.

Just wait and see what they will adapt in near future.
Yo-game always have good solution to solve problem.