I am using B2 now - I started using it before they added the encrypted buckets and am using restic to encrypt everything. It’s nice because I don’t really have to trust Blackblaze at this point aside from them not losing my data.

I’ve since additionally turned on encryption on my buckets, but as far as I know they store the key for you, so in terms of privacy it’s not the best.

Maybe I am not average but I blow past 300 pretty easily. I also think you may underestimating how much people search on their phones.