Interesting questions.

Spam-bots attacks are already happening, it means the fediverse is already recognized as a valid alternative to big corporations, tho I don't believe the fediverse is seen as a "threat" by them, not yet at least.

I don't agree reddit is nuked, like twitter isn't, they're getting a blow for sure but they'll live regardless.

People seeking honest interactions and quality discussions are a minority, the vast majority is content with shitposting and memes, many don't even know what's happening or don't care, look at how little it took for the protest to wane, some subs are still protesting or migrating, but the majority reopened and they're going on like nothing happened.

Admins can protect up from bot armies, they're doing a good job already, it's up to us to help them reporting when we see them.

Do you think Reddit/big companies will make attacks on the fediverse?

I don't think so, it would be a waste of resources, they don't see the fediverse as a threat, it's true we're growing but we're still hundreds of thousands against hundreds of millions, different order of magnitude.

Do you think clickbait posts will start popping up in pursuit of ad revenue?

Clickbaiting will indeed start, if not already, but by users, not corporations, and drama stirring posts for views (that's happening already), it can be contained by enforcing rules and having enough mods to deal with it IMO.