SOLUTION: I HAD SAME PROBLEM ON IPHONE 16 PRO MAX WHEN I UPGRADED TO 18.3.1. This reditt post fixed the crashing on all google apps. I had the same 2gb Google LLC file that probably caused the issue:
"Here is what the problem was and how I fixed this. I knew something was staying behind that was constantly tripping things up on these google related apps on iOS. I eventually asked ChatGPT to help me troubleshoot it, and it did mention something about clearing out data from the google app in the iPhone Storage screen. I thought not a bad idea.
I find in there this app called "Google LLC", and that it's tied to 14 different apps on my phone and that it's almost 2gb in size. BINGO. This is where whatever old data is tripping things up lives, but i can't just delete "Google LLC". I have to manually uninstall every Google related app there is on my phone (14 of them). After that i rebooted for good measure, installed Google Search (which reliably crashed for me) aaaand... no crashing, solid. I install all my other apps, I setup my personal gmail account and my work google account, still solid, I open all the other apps that were breaking, totally cool now.
I hope this helps someone who runs into this, I use Google products alot for work, and it not working on my nice iPhone 14 really was irritating and interrupted my daily workflow. Enjoy!
FYI this is not my phone screenshot, but something i googled and copied, remember my version was 1.9GB and shared to 14 apps. Probably too big and prone to failure."
[Edited by Moderator]