Does anybody know for sure that anything is actually sustainable at any price point for any number of users? Buying into a service, either through time or mone

Does anybody know for sure that anything is actually sustainable at any price point for any number of users? Buying into a service, either through time or money means risk on the part of a user, no matter free or paid. Something remains open or something closes. Who knows. I hate to sound like a god damned schmuck, but there are no guarantees in life, not the least of which when it comes to such frivolities as rss feeds.