I'll upgrade this idea a bit.
Stop ALL kinds of popups while donating to a GB.
Just this morning I was 10 FP away from securing a spot on a GB, and this large thing called SPECIAL OFFER popped out of nowhere, covered everything, and when I dismissed it the game would be stuck with the loading indicator. I had to fully reload the game, luckily nobody sniped me, but it was hella frustrating.