"Why is the team developing the thing you find valuable getting compensated for that concerning?"

It's about the value they'd have that would allow them to negotiate a deal you probably wouldn't have taken if it had been offered to you up front, i.e., "lock-in".

But I blame the project for letting themselves get locked in, not the company for trying to make the money.

Open source projects are usually unfunded and to a first approximation have a budget of $0. This makes them a strange case.