Google Sheets (and Forms with Sheets-integration) has been the bane of my privacy-first drive. The only other spreadsheet+cloud tool that I've been able to find to handle my processor-hungry tables is MS Office (which is frustrating to use on mobile, even with the app).
I've been searching for an alternative for almost 3 years at this point... and I keep coming up empty.
I know I could probably cut it if I could manage to learn programming well enough to do my data processing in python or r, but getting over the hurdle of "I can already think in spreadsheet formulae logic/I can't yet think in [insert programming language]" is a mountain I haven't yet been able to scale.