There's a sort of a hobbyist/professional split. There's a lot of grey area inbetween, but it's easier to reason about it if you think of two markets. One will pay, one won't if there are acceptable free alternatives. But it turns out that there are rather big synergies to be had from both camps using versions of the same tooling. So you have enterprises that are willing to buy pro versions of tools at prices that subsidize the existence of users at the free tier. That's nothing like the old Borland model that the post I was responding to wants Delphi to go back to.
