I think they provide tools to do this. You can do google takeout, then set your privacy settings to delete after X amount of time. We can hold good faith that they do so? Other than that, i guess you can contact them?
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AFAIK Google is the biggest advertising platform on the planet and the idea that anyone could delete all their content from that platform is not one that I'd consider likely.
I'm happy to be proven wrong, in fact I'd be delighted to be wrong.
One example which was hard for me to remove, at least in bulk: contributions to Google Maps (photos). I also answered survey questions about POI and I dont think they can be removed at all.
All before I discovered OSM....
Just delete everything in your account settings and pray they actually do. It's not like they'll let you audit their servers to confirm they did.