if i am not wrong google give free gsuite for university and school. Admin provide free edu account to students. however i think after student finish his study those account get archive or something. if you are admin of edu gsuite you can create free edu account and sell it online. 1~5USD one time payment. but your account can be remove anytime because admin can remove your account if he wish.
other hand if you are paying gsuite monthly plan you will have full control over your account. as long as you don't share copyrighted material in public you suppose to be fine even though there is copyrighted material file for personal use.
dropbox is also fine but not user friendly for data hoarder (movie/tv etc collector). few years ago i read somewhere they check md5 hash and remove files. well that does not matter you can encrypt your file using rclone. BTW its looks like dropbox unlimited plan is way more costly.