> My perhaps unreasonable hope for a Facebook killer is just a paid personal archive of your own photos, writings, etc. with the assumption of privacy by default.

Really, the only reason Google’s collection of online services (Google One, basically,though the individual services mostly are older than that bundling) falls down here is that several of them use unguessable URLs and URL sharing as the private sharing mechanism (at least for read only sharing), instead of revocable access delegation.