Yes, the problem here is that people see these services as the sandwich rather than the person handing out sandwiches for free.
The sandwich is yours and you should be able to trust it, but you shouldn't rely on the expectation that the same guy will be handing out sandwiches for free at the same corner every day. They might just not be there one day, or simply tell you "I don't like your face, you don't get sandwiches anymore".
Facebook is the sandwich guy, as are google, microsoft, etc. Enjoy the free sandwiches, but plan in a way where you wouldn't just starve without them.
The sandwich is yours and you should be able to trust it, but you shouldn't rely on the expectation that the same guy will be handing out sandwiches for free at the same corner every day. They might just not be there one day, or simply tell you "I don't like your face, you don't get sandwiches anymore".
Facebook is the sandwich guy, as are google, microsoft, etc. Enjoy the free sandwiches, but plan in a way where you wouldn't just starve without them.