When we started SmugMug in 2002, everyone said we had no chance because Microsoft, AOL, Yahoo, HP and Shutterfly all offered unlimited free photo sharing and they were blue chip brands with the money and scale to sustain it.
Microsoft eventually sent an email announcing their closure and you had two weeks to fetch your photos or lose them.
When my sons bought Flickr, they had to quickly do away with the 1 petabyte of free storage.
Meanwhile, Apple charges, they store an unimaginable amount (I know the number), and they make bank doing it.
Amazon offers unlimited photos, both RAW and jpeg, with your Prime subscription.