The question has no meaning. "control things within your control" is like a truism, grammatically and logically valid yet says nothing.
The point was that it's pointless to even think in terms of "apps and devices going around my choke point" because there never was a choke point in the first place.
If you want to prevent an app or device on your network from accessing an IP, you must 1: Ensure the app or device has no wifi or cell or any other possible physical connection of it's own that could allow it to reach the internet without going through your router. 2: Block the ip, by ip, in your router, and also any other ip that could serve as a proxy or relay.
It is impossible to know what all those IPs are, so what is possible instead is whitelisting instead of blacklisting.
You could do that, but was it useful or interesting to even say? Didn't you and everyone else already know all that?
