Apple's HomeKit allows you to firewall your IoT devices, if you have a Wifi router that supports it.
Since that kind of privacy cuts into the profits of shady IoT companies, they don't support HomeKit.
I'm not interested in trading my privacy for the pithy convenience of moving the dishwasher start button from the machine to my phone.
[1]: Yes, I know. There exists Matter-upgradeable widgets that must be connected to the Internet before becoming usable as Matter devices; send those back. I'm also aware that there's Matter devices that require Internet in order to be useful[2], but every instance I've seen of that is just something that was designed by a moron, imbecile, or idiot; send those back, too. Returns cost these companies money.
[2]: https://www.reddit.com/r/TrySwitchBot/comments/1j8ogt8/matte...
For any device that needs to connect to the internet, you want to be able to use dns and ip block lists at the very least.
These changes are on my todo list. Tvs especially need to be quarantined. They scan your network to datamine and try to report your conversations to the tv manufacturer.
The next step is root the tvs and clean off as much junk as possible.