The problem is that, given the greenhouse forcing, those leaks will arguably cost society much more than a few $billion per year. It's just that the gas industry isn't legally responsible for that. And that's why they don't want to stop the leaks.

Many companies don't do shit as long as they operate with a profit.

What happens often is that s small player seizes the opportunity and then gets bought.

Maybe there are regulations that keep smaller and / or separate entities from acting in this regard.