Sure, but there are a lot of things you can do with the use of a good firewall, Pi-Hole, VPN, et al, you can mitigate those leaks. Anytime I fire up a new piece of software, my firewall pops up and says ‘Hey bro, you really want this chatty piece of software running uninhibited on your network?’ and here I go plugging holes. It’s not 100%. Some software absolutely refuses to work unless it has internet access. Bluebeam comes to mind. You do what you can, and decide if the hardwired software is something you really need or not.