[thfuran]

You can agree to pay someone's legal fees but you can't generally file legal action on their behalf without their involvement. So they could potentially defend the software rights of people who are sufficiently easy to contact and willing to be at least nominally involved in legal proceedings.

[charcircuit]

They could just send you on email: XYZ is violating your license for project X in their project Y. Do you wish to take action?

[chii]

and if there's no reply, what happens? You cannot assume the copyright holder is affirmative in this case, and file a suit.

[jen20]

If there’s no reply, there’d be no action.

[charcircuit]

Then you wouldn't pursue it.