Gas leaks have the potential of resulting in serious damage to the pipes, besides the losses.

According to the article most “leaks” are intentional venting.

Yes, those are problematic. This tends to happen when a pipeline changes payloads. I know a little bit about this: typically what they try to do is to shuttle the 'interface' to a segment long enough to contain it completely, then vent that section by opening a valve at the end of the section, then push new material in until the mixture reaches a certain level of purity.

Unfortunately, the mixture is useless and vented into the atmosphere. There ought to be a burden of responsibility to deal with that in a more ecological way on the pipeline operators, but these tend to be in bed with the nation states that are home to the pipes.

A pipeline carrying a single substance or single mixture of substances can still vent, usually that is to deal with pressure excursions and is a safety measure.

That word right there "potential" is the culprit here. As long as that potential is within "acceptable" ranges of unlikely to happen, nothing will be done.