@Tutanota and me that always said there is a simple way to do this without the need to rely on any third party crap to verify your identity.
blockage at isp level of dns and vpn until the landlord proved he is adult (witch is stupid but hey), and once he ask the disablement of the blockage he signe (electronically) that he will manage the computer in his home (once ok the dns lock is lifted)
for mobile it can be managed phone by phone
would be much more effective than the app / os level crap.