If I understand you correctly, you’re saying that governments might leave Twitter for threads and we should push so they use mastodon instead? Assuming that is what you mean, I don’t think that makes any sense.
For one, I don’t think government accounts are a main driver for social media users. No one ever said "I only use this service if the UK government has an account there". Governments go where the accounts are.
For another, you can push all you want, if it’s not something that people want to use it’s not going to work. Our best hope is for threads to actually implement activity pub and then being able to use other apps and servers, while still being connected to the "rest of the world".
I think the reason why meta wants to federate is this:
I don’t think they’re doing it to "get more data" or to "take over the fediverse". There’s nothing worth taking over for them currently and since most people don’t care about the fediverse I don’t see it growing much either. Although I’d certainly like it if that were the case.
They can probably get the data already, it’s all openly available. Federating it’s basically all upside and no downside for them, but it’s not exactly the biggest priority to implement it, it‘s going to take some time.
I’m not saying it might not have a negative effect or that they care a lot for what’s currently there. They’ll certainly want to monetize threads sooner or later.