[_tom_]

This is correct. The only difference between this and commercial software is the user expects a fix for free. No commercial vendor is going to revert an important change for a customer giving them zero money. If you are paying them millions, then sure.

Open source can be the same. Offer Reem millions, your problem will likely get fixed. Even a low bug bounty might work. But, exactly like commercial software, people won't break lots of users to fix one user without a lot of motivation.