If anything we're talking about frontend JS code that can be blocked by most adblockers/tracker blockers and thus will never touch your data, rather than the uncircumventable "your data is hosted on Google servers".
And the latter does raise alarm bells for a tiny minority, but why would frontend be worse in that aspect?
With frontend code, it’s code running on your machine that you can’t personally audit written by a company you don’t personally trust. For some situations (enterprises) and people (FOSS enthusiasts, paranoiacs), that’s not at all okay.
If anything we're talking about frontend JS code that can be blocked by most adblockers/tracker blockers and thus will never touch your data, rather than the uncircumventable "your data is hosted on Google servers".
And the latter does raise alarm bells for a tiny minority, but why would frontend be worse in that aspect?