"Flickr used to have free 'Lifetime' accounts with 1TB"
Which is usually the same underpants gnomes plan over and over. Sure, you get a lot of users on board, just no one pays and the money to run the systems has to come from somewhere - and for this kind of business there are not enough Pro to subsidize the freeloaders.
You can walk away or just wait for the system to be shutdown for foreclosure.
Facebook, Google and Microsoft will exploit your last bit of data in exchange for some "free space" - while you also usually lose most of the rights on your photos.