I don’t think the ffmpeg maintainer is complaining that Microsoft is using ffmpeg, rather that they are opening “high priority” bug reports based on customer complaints.
Users can only assign priority to issues they create themselves if they are explicitly authorized to assign priorities.
If you provide access to that field but then complain that bug reporters use that field, you're complaining about how you misconfigured your service, not how end users are using it.
Are there any other people targeted in this sort of complain, or is a specific company being singled out just because some low-level grunt filled in a field in a bug report?
I think for most cases getting the cash is the easy part, and the hard part is getting all the paperwork in place to validate payments to random external entities. If that was easy, nothing would stop any low-level manager from making cash payments to random users with a GitHub account.