The GCE free tier is nice but ran out for me after just about a month of continuous use of one (cheap) GPU. Maybe some people have deeper pockets than I do but I can’t afford to pay $300 CAD/month on a single cloud GPU for hobbyist purposes.
Kaggle seems to offer a lot of free GPU services if you want to have your notebooks be public.
vast.ai is also an option, which is cheaper (though also not as nice as GCP)