We left appalled. We sent him to a public school instead, where they use screens much less (although they do use them, sadly) and they have books. I don't know to what extent this is a voluntary choice or just because they have less money to buy gadgets, but the result is better anyway.
On the other hand, these kids will eventually end up in a world saturated with displays and maybe even AR, so there's some argument for getting them involved with digital stuff at some point.