Dropbox
While you still have to pay I'm surprised that Dropbox still has their unlimited storage with Chia mining about now can't be long before someone signs up for the 3 user unlimited plan and throws in 1Pb of plots. No not a free tier but I'm pretty sure the $65 per month isn't going to cover that storage cost.
Then again I'm sure it's already losing $$ given the number of people I know who use it as a backup service for 100's of Tb.
Or did I just break ]some unspoken rule of making someone aware of this (I'm sure not how many "Unlimited" cloud storage products have come and gone over the years).