If you are looking for stuff from big publishers then yeah it's gonna be a bit slow/empty but there are a lot of small/indie devs on bluesky and it's awesome being able to interact with them directly without all the spam that usually came with posts on twitter.

It's a chicken-and-egg problem. Fortunately it appears that utility accounts are slowly popping up now that there's an audience.

For NASA, looks like someone has made an unofficial mirror account:

https://bsky.app/profile/nasa.extwitter.link

Also, some game companies do maintain a presence on bluesky:

https://bsky.app/profile/sega.jp

https://bsky.app/profile/panic.com

You will find a lot of games, studios and bands on Threads.

Since it leverages Instagram and has pretty fantastic photo features.

Yeah. Twitter/X after the Russian invasion quickly let me connect to serious professionals in US-Russia relations, war, etc. e.g. War on the Rocks and Mike Kofman, the Truth of the Matter by CSIS, etc.

Are there easy tools that allow you to post on multiple platforms from the same content, that also supports replies?

Yeah I've been missing these people too, but I just noticed them suddenly appearing on bluesky over the last 24 hours. Things are afoot.

I'm a web dev and follow a lot of companies and organizations in the web dev sphere and these all created accounts a week ago. Other sectors will probably also be jumping as lumps. When a sizable chunk moves, then the others follow.