I bought a Meross plug and found it “phoning home” (to where? it wasn’t clear) all the time. I blocked it on my firewall, but it’s a worry with these Chinese devices. You give them access to your home network, and then they dial out to their home servers.
You have no idea what they are doing, but they are inside your network at this point. So if you must use them, at a minimum make sure you are using encryption for all traffic, and that your firewall (outbound as well as inbound) is well set up. I understand some versions of the Meross plugs had an undocumented web server running on them too.
https://blog.mi.hdm-stuttgart.de/index.php/2021/09/09/why-its-so-easy-to-hack-your-smart-home/
I am sure MR gets a decent kickback for promoting these things, but buyers need to be aware. Especially in the world we live in today.