The problem is that people always have some kind of bubble when they look at their surrounding. If not because they've got friends with similar intrests or way of thinking, then because they interact with you. And that's not necesarily bad, but something to be aware of when judging things in a general sense, like "is this service dying".

For example, almost everyone I know is on Signal. However, statistically, Signal is teeny tiny in my country. Then how come everyone I know uses it? Because I do and I refuse to use WhatsApp (the by far biggest player here) so they got it to interact with me. While for SNS that trigger is less strong than for direct chats (which pretty much replaced SMS by now), people you know recommending or even talking about it mouth to mouth does do a lot, whereas a random news article or even people having to search alternatived themselves will cause way less change. The fact you mention it to your friends and family already creates a bubble.

That's why you should look at general statistics. I don't know about the blind community, so maybe they did switch, could be. But in general, looking at all users, while the numbers of users have dropped following their controversies, they've never been anywhere near dying, and most users either stuck around while trying alternatives or came back to the big tech SNS they used before. Only few left for good.