Nah the reason is way simpler and more craven: so people like you will post what you just did. They can stop whenever they want; no one's making them do any of this.
There's two possibilities here. One: they know this tech is crazy and they don't care that they can't contain it. Two: they know this tech is mostly bullshit and they don't care they're perpetrating an insane fraud.
No one's making them do it, but just because they stop doesn't mean others will. Pausing just means they give up control. It's like asking the US to unilaterally disarm -- it just guarantees that the less scrupulous groups win.
Anthropic is explicitly calling for a coordinated pause: https://www.reuters.com/business/anthropic-says-ai-labs-need... Maybe this is a lie, but the way to call their bluff is to push on competitors to agree.