I agree with the ethos but "banning installing" wouldn't have been correct here.

There should be terminology for installing from the source of your choice which doesn't carry the marginal or sinister connotations of "sideloading" though.

"Freeloading" would have been a good one but... yeah

Wouldn't it be accurate to say that you can no longer install apps on your phone, only Google can?

I'm not suggesting a drop-in replacement within that context, just that widening the definition of sideloading does us no favours

'installing from beyond the walled garden' would be a nice fit here imo

"banning installing from anywhere but play store"

"Freely installing"?