I believe elsewhere in the thread someone stated that SmugMug's terms (including on content) would also apply to Flickr starting in late May, so that's something to look into.
Looks like they are ruining flickr right out the gate.
thankfully it is quite easy to start a flickr clone these days. buddypress with rtmedia or mediapress and bam it's done.
I was going to start podcasting with anchor fm, but reading over their terms it would be trivial for one group to to get another banned easily and vice versa, so there is no staying power / ownership of data there.
Seeing the loss of data when an account is deactivated at tumblr, fbk, gplus, or other portals, it's not worth creating a community or group within these digital sharecropping portals.