> One can engage on multiple platforms. Don't have to leave something else to use Mastodon.

Sure, and those who have a technically savvy audience can use Mastodon can post on multiple platforms.

In this instance of bad changes X has made, the majority of those who are moving away from X this time round are more likely not going to engage on Mastodon as a second platform.

Too much hassle for them.

They are more likely to engage on platforms that have more engagement, like Bluesky or Threads.

I cannot see artists, journalists, etc going to Mastodon when X makes changes to their platform time and time again.