I feel like we're having an actual discussion now. However, you go on about proving everything, while making unsupported claims yourself, don't you think that's a bit hypocritical? Ah wait, I'll give you some examples.

Federating with a 10x larger entity that has a ton of very well known names on their list is going to dwarf anything that the fediverse so far has to offer. I‘m not saying in quality but definitely in quantity.

Claim 1: no proof this will happen, each instance can decide the degree of federation, no amount of users can dwarf an instance they cannot federate with. Blocking the instance yourself will exclude yourself from any of Meta's shenanigans immediately.

If meta ever defederates or limits the capabilities of fediverse instance

Claim 2: meta cannot limit the capabilities of the fediverse, if they change what ActivityPub stands for, we will fork ActivityPub into what it's supposed to be, having our federation sans meta like we have now.

thousands of (again) hooked addicts will flock back to them. It’s literally obvious if you have any experience with addiction.

Claim 3: Obsolete platforms have no way of defeating obsolescence, here's a paper on why dead internet platforms cannot be revived. There will ALWAYS be algorithmic, profit driven, centralised platforms, why would meta choosing to defederate lead to a mass exodus of lemmy when people who want that are already getting their fix? If anything, it could lead to more people joining lemmy instead. The point is we don't know. Also, making a statement like this is textbook fearmongering, which leads me to my next point.

Fearmongering is if the media or the government does it, not people who are actually there using the stuff and suffering under things. That is called asking others for help/to understand.

Claim 4: Fearmongering - the action of intentionally trying to make people afraid of something when this is not necessary or reasonable. source

It is not reasonable to deny everyone the federation of meta because you fear a mass exodus back to facebook, according to my previous source people will find their algorithmic fix elsewhere, but rarely the same platform.

Because it is the right thing to do.

Claim 5: "the right thing to do" still does not mean anything: for ukraine the right thing to do is for russia to give back their land. If you're russia the right thing to do is for ukraine to give back their land. You see how this statement holds no value at all?

"social media is a drug"

Claim 6: I agree with this one, so here are your sources why decriminalisation, ie not punishing users of them, but providing them the resources and tools to help them, is the way to go. Not one, but two sources backing that up.

Denying people the option of a federated meta instance will cause less people to switch over, period. Having a place where people can still access the other platform, without actually being on said platform will drastically increase the userbase.

Don't take my word for it, just listen to the lemmy devs:

In practical terms: Imagine if you could follow a Facebook group from your Reddit account and comment on its posts without leaving your account. If Facebook and Reddit were federated services that used the same protocol, that would be possible. With a Lemmy account, you can communicate with any other compatible instance, even if it is not running on Lemmy. All that is necessary is that the software support the same subset of the ActivityPub protocol.

Unlike proprietary services, anyone has the complete freedom to run, examine, inspect, copy, modify, distribute, and reuse the Lemmy source code. Just like how users of Lemmy can choose their service provider, you as an individual are free to contribute features to Lemmy or publish a modified version of Lemmy that includes different features. These modified versions, also known as software forks, are required to also uphold the same freedoms as the original Lemmy project. Because Lemmy is libre software that respects your freedom, personalizations are not only allowed but encouraged.

source

So, from the 6 claims I listed, only one can be sourced.