How to Stop Google signin popups

Your understanding is 100% correct.

Strictly speaking not even Google can do anything about it. It's an API that they developed and made available to whoever wants it, for whatever purpose that might be... which is usually 💰... but they certainly can't stop websites from incorporating it if that's what they want to do.

https://developers.google.com/identity/sign-in/web/sign-in

By the same token Apple can't do anything about it either. Apple has their own, equivalent "sign in with Apple" API that website developers can choose to implement just as easily, yet for some reason nobody complains about it. I wonder why 🙄

Contact whoever maintains those websites and ask that them to remove that unwelcome page element.

You've already been given the only correct answer there is. Don't visit those sites...

Exactly. They're frankly desperate to have people use that (unwelcome, intrusive) "feature", and it shows. It's "in your face" annoying. Of course that's my opinion, but it seems to be a rather common one.

Since websites also rely upon $$ for their existence they are unlikely to accede to its removal. Our only recourse is to boycott those sites... and tell them why.

All websites cost money but Apple Support Communities is one of very few that don't rely upon advertising and other annoyingly intrusive schemes to support it. Running this site can't be cheap, but we already bought some Apple stuff, they already made their money, and they have lots of other ways of persuading us to spend more. Their respective business models couldn't be more different.

I am

only on an IPhone right now.

Due to health reasons I have not been able to replace my OS desktop or laptop yet.

So please don’t send a thing NOT related to iPhone13.

when I get my computer I will fix all needed.

thank you

Jo*****p or jr******@icloud.com

[Edited by Moderator]

The only way to avoid that is to not visit sites that support 'sign in with google'.