Worth keeping in mind that Twitter/X is something like the 8th largest US-based social media site. Like it's ~1/6 the size of Facebook.
It's in all probability smaller than Pinterest (we cannot get trustworthy numbers from Twitter/X). LinkedIn is 2x its size, and real people across a swath of society use it. Knocking Threads for the Instagram distribution is silly because part of the point of posting is to get distribution. This is a PLUS for Threads, which organically is still close to Twitter/X's size.
Nobody is saying it's urgent for brands to be on Quora, a close size mate.
Of these sites, Twitter/X is the only one that (effectively) requires brands to pay to post.