Microsoft employee:

Hi, This is a high priority ticket and the FFmpeg version is currently used in a highly visible product in Microsoft. We have customers experience issues with Caption during Teams Live Event. Please help

Maintainer's comment on twitter:

After politely requesting a support contract from Microsoft for long term maintenance, they offered a one-time payment of a few thousand dollars instead.

This is unacceptable.

And further:

The lesson from the xz fiasco is that investments in maintenance and sustainability are unsexy and probably won't get a middle manager their promotion but pay off a thousandfold over many years.

But try selling that to a bean counter