There are still a lot of people using Cpa grip and other content locker companies, and they make really crazy profits, even 10k / 20k a day.
I also still make money with them, not with cpagrip but with other similar sites (Cpabuild / Ogads).
So, to your question: Should i start now?
Yes you can, but you will have to find the right strategy as the other guys at bhw said.
You will have to choose whether to advertise the offers through: blogs, on tik tok, on youtube, on instagram, with paid traffic, etc.