What we have here is a glorified set of blockers that could be replaced with a couple of PAC files and a pihole/nextdns. The screen time stuff is builtin to iOS and Android.
If you really think you have a problem with some addiction, TALK TO A PSYCHOLOGIST. From my experience with cognitive behavioral therapy, it's usually the problems have nothing to do with your will-power or the phone/app/game/site itself. It could even have many other side effects on your life that you can't see like anger. There's absolutely nothing that can replace personal treatment with a psychologist. People invest money in many things and I think getting help from a real qualified psychologist rather than a faceless corporation and an "app" is probably the most important investment one can do, besides getting a place to live.
Don't fall for bullshit products like this one. They're usually done by scammers capitalizing on the pains and misfortune of others.