A lot of people are being fooled by Google Photo's "free unlimited storage" when the truth is, this is not a backup AT ALL.
Google Photos will recompress your photos into smaller versions when you use the free tier. It is NOT a backup because your data isn't being backed up, only an approximation of it. I feel sorry for people who "feel safe" that their entire photo collection is "backed up" on Google Photos; if they lose their original, all they'll have is slightly lower quality recompressed copies.
Flickr, to their credit, DOES store bit-perfect originals, but you have to deal with ads everywhere.
There's no free lunch and that includes Google Photos. That said I do wish they'd lower the cost of cloud storage, but that's not something we can control. All the companies charge more or less the same amount.