Because despite the fact that they're both free and cost nothing to use, a lot of government agencies, companies, and press refuse to use or crosspost to Mastodon or Bluesky.

Literally the only cost is setting up an IFTTT workflow or a script, or having an AI agent do it for you, etc.

People will complain, in the same sentence, that bsky/mastodon will dilute their follower count and interactions, and "nobody uses it."