Kids get past "don't allow" delete/download restrictions

Hi. My kids are getting past the screen time "don't allow" apps to be downloaded/deleted restrictions by deleting and downloading YouTube and Brawlstars so that resets their screen time for that app each time they do it. How can we restrict kids from deleting and redownloading apps like YouTube and Brawlstars? Please help. They learned this from other kids so this is a big issue with Apple screentime!