I have also switched to iphone to a better quality of e-life, but you need to avoid using anything google related altogether , at a certain point google services are not something they sell or make business with, their job is to show you advertisement and spam, so the rest is just a side gig to better do their primary thing, so one is better off just avoiding them, these replies in the post are just as pathetic as the company itself, people always report these spam (this is not the first post about it, there was also a guy a while ago who had a fight with his wife because of the sudden spam on google drive), it's just PR

I've been receiving these on my iPhone (via Google Drive app) with no real recourse. This problem isn't limited to Android users.

My complain was about this policy let this happen. Obviously in a company like Google there should be company wise rule which won't let a stranger able to send notification to my phone.

Strangers have always been able to cause notifications to appear on your phone - notifications for SMS, social media, calls, email etc can all originate from people you don't know.

With my permission though. Those are expected and under my control. But in this situation it is not even expected to stranger to be able to share files with me and notify me. I dont even receive e mail for that instead direct notification to my phone. Spam is not problem for me. What bothers me is just this stupidity comes from Google which unfortunately i rely on too much by using android.

Decent services allow you to whitelist those you want to allow to notify you. One of many reasons I don't use Google Drive or any Google product.