I don't see them begging anywhere, I only see someone sharing a link to their donate page.

For what it's worth because legal names are confusingly similar, this is a legal subsidiary of Mozilla that is specific to Thunderbird, as in if you give it money it goes straight into Thunderbird. Many people here pretend to wish to be able to give money directly to Firefox, yet when they can do that for Thunderbird, people here are still finding bullshit reasons not to do so. Pick a lane.