In the end no company is obligated to do much of anything. We see that twitter probably wouldn't have achieved the kind of market dominance they have if they had started out this way though. So it feels like a sort of bait-and-switch, which annoys. That now that they have we have to deal with it or be cut out of something so popular, that they can only get away with because they are so popular. But sure, they have no obligation to not do that.