Signals usually appeal to those who tried trading but sucked at it, and that after many attempts. If we keep in mind that ~90% of all traders lose (regardless of what they trade), it's not really a surprise some of them revert to signals.

Based on the very large forex signal groups (100k and onwards followers) that I have seen in the last couple of years, I have to conclude that the demand for their services is going through the roof, so no, they're definitely not out of business.

If even 10% of them pay every week or month for their subscription, that's a lot of money they generate, and that just by releasing a few signals on a daily basis. What a life they must have scooping up money that easily.