Most likely the functionality of streamers continue to improve, leading to reduced subscriber numbers until they get bought and incorporated into one company’s products. Or they try and hold on, updates become less frequent and customer support goes away, and they slowly disappear into obscurity. Or they shift to licensing direct to manufacturers to incorporate inside components, instead of separately sold to users.
Today’s special purpose software gets incorporated gets incorporated into the operating system of integrated suite. That has been the way since, well, the first computer language.
If you’re a lifetime user, then just enjoy it until you need to buy something that doesn’t use it. It’s nice not having a monthly fee.