Actually, as you pointed, there's a BIG difference between

- "this is free forever" (remember FaceBook moto), killing the market using this and then, when there's no nore competitor (on specific age class for example), saying "OK, now pay"

AND

- "this is a charged service, but you may access it for free as long as you respect some limitations" : in that case, from day-1, you know that either you'll have a basic service or you'll have to pay someday.

Note: in the second case, when a "free tier" is degraded to force people to pay, it's the same problem as Facebook...

In fact, I think that the real problem here - and what people are fed up with - is the bait-and-switch

1) I promise that I'll promise something for free forever 2) People trust me and invest in me... so I kill the market 3) Then, when there's no real competitor, I try to charge

Even for capitalist, this way of doing business is just: how to build a monopoly to evade the market competition

So yeah... let's sue Facebook... and make it a clear example for all businesses around the world that this way of doing things is definetly NOT OKAY