Most people commenting here don't have kids. Private schools are so prolofic because the majority of public schools are so defunded and sad looking that there is a native demand for schools with... non-below average facilities which families are willing to pay for.
This country doesn't spend enough on education and instead is letting its citizens fund the education sector out of their own pockets. It's kinda criminal.
So instead of blanket banning private schools we should be funding public ones to the level that makes most private schools redundant.
Check out a developer called yiotro. His stuff aint flashy and almost entirely strategy/puzzle but are light on resources (i.e you can pick up and play/stop whenever without losing progress. Also won't kill your battery), and not most importantly not bloated with ads. The perfect time killer.
Some of his games are pretty fun/addictive/challenging. Paid versions are a few bucks and free for life.