This is super interesting! I'd been wondering how engagements would compare for the big names on twitter. My twitter engagements felt like they'd flatlined. But I've got low numbers and never paid for a blue tick.
One thing I noticed on Twitter was how my engagement had slowly been dropping in the last 6-months. I don't plan on cross-posting there anymore, but for one last one, earlier today I did one as a test to see. My audience there is 40x bigger... same engagement.