That's the trend, eg Borland. But Jetbrains is making money. There's also a bunch of static analysis tool vendors. We can model open source as cheap copycat i

That's the trend, eg Borland. But Jetbrains is making money. There's also a bunch of static analysis tool vendors. We can model open source as cheap copycat inports: you can't make money at the low end, but must go up market. You have to keep improving to stay ahead of the tide, but eventually there's no up market left and you are sunk. So you have to jump across to the next island.