Take the big corporation's move as a victory and vindication of your open cause, but also see it as a wake-up call and challenge to support your favorite implementation's developers and their spec writers, whether by money, code, or simple evangelism ("hey bestie look at Misskey it has custom reactions which you can't do in Threads!")

I sort of think this is wrong. The reason they're currently playing nice is because they see a green field that's open to them. Fediverse has been a success! This is true! They wouldn't bother to EEE it I'd it hadn't been.

But, this is always how it goes. This is the "embrace" phase of the cycle. I don't think the people who are virulently opposed to Facebook integrating are oblivious to that. And also, using it as an opportunity to tout features threads still lacks, I think, is a losing game, because Facebook has billions if dollars and the ability to clone any features someone might want. An open project like any if the fedi clients cannot compete with them on features, all it has is the ability to say "we're not going to enable a genocide like FB does and we're a bit better at respecting your autonomy and privacy."