From my understanding thunbird is somewhat separated from this. From the article linked by OP it says:
What’s crystal clear is that Thunderbird’s ever-increasing donation revenue (currently its sole source of income) is allowing for some explosive growth that’s long overdue. To add some context to this, Thunderbird received $2.8 million in donation revenue during 2021. Two years later, in 2023, it received $8.6 million in donations. I’m told that total financial contributions for 2024 were even higher, though the final amount hasn’t been officially released.
ILikeBoobies@lemmy.ca 22 hours ago
The anti-monopoly lawsuit against Google fixed that
fortune.com/…/mozilla-firefox-biggest-potential-l…
Now Mozilla has to find a way to offset that loss
finitebanjo@lemmy.world 22 hours ago
Nice! Good for them.