It's been offline since like 2014, so probably wouldn't even work on newer Android versions. But we did have competition, so it seems like there should be equivalent functionality today.
Have a look at "Family Link". It is not perfect, but it can limit usage of apps and the whole device to specific times (and more).
I have used family link, it's kind of all or nothing deal. I want the ability to define block schedules.
I want to be able to put some sort of delay when opening time wasting website so that it is not as addictive.