Ironically, three years ago, Musk encouraged the use of Signal and tweeted: "Use Signal", https://x.com/elonmusk/status/1347165127036977153

Edit:

In my opinion, Elon Musk initially endorsed Signal because of its strong encryption, security, and commitment to privacy. Now, he's blocking it for those very same reasons—what a blatant double standard!

On a related note, one of the key advantages of the modern internet—and more specifically, social media—is that everything you say publicly is archived. This means that if you ever do a complete 180° on your claims or principles, it can easily come back to haunt you. So, it's always wise to be mindful of what you say and stay true to your values.