I've always been suspicious why Chinese companies are adding internet capability to products where it doesn't make sense. Why would a power converter need internet capability? TCP/IP capability...maybe. But internet? Internet means "the whole world can access my device." Same with IP cameras. Or EV chargers.

And they require it. Without internet connectivity the device simply won't work. This sounds fishy to me.

These devices should only be allowed to access local network addresses and no (internet) gateways.