Dropbox is a lot more trouble than what it's worth. When you share a folder with someone else and drop a large file in it, not only does it use up your available space but also the account of the person you shared it with. Double dipping. Sometimes I have to delete my files I uploaded so they can upload a file. Dumb.
They've done this since day one. Yeah, I think it's horrible. What I love most about Dropbox is the LAN syncing. Great way to get files from one computer to another. Now that all I use is a MBP, not much use for it. lol.
I have an unlimited space from G Suite for Education.
Yeah those are fun, as long as it's a 4 year university or a college that doesn't delete your account or deactivate it the moment you're done. I've lost one (and all its data) this way because the admin thought I was a student not coming back. My wife lost hers after a summer program stint.
I did have a Google Business account with unlimited space. That was fun. Only problem I don't like about Google Drive, when a person's account is deleted, all their files are bye-bye if the admin chooses to do so. That and I don't use Google anymore if I can help it.