You can just look at the numbers. They're seeing 15x more engagement on BlueSky, and even more engagement on Mastodon compared to X:
X post: 124 comments, 79 reblogs, and 337 likes
BlueSky post: 245 comments, 1400 reblogs, and 6.2K likes
Mastodon post: 403 reposts, 458 likes
There's more ROI posting on BlueSky or Mastodon, even ignoring the fact that BlueSky and Mastodon are projects clearly more aligned with internet freedom than X is.
(edited for clarity)
And the EFF is also looking at conversion rates for those views. Are you convinced that the Elon-pilled still on X are interested in donations to the EFF compared with the weirdos on Mastodon?