To have the ability to text you about an open door it would need to track your usage, have access to your phone number, and access to your home network (unless they put a sim card in there). Having access to all that means they can gather a lot of information about you will little effort.

Edit: Not to mention that by having access to your phone number they can push you ads directly to your phone. Having the screen and internet access it will have the ability to push ads on the fridge itself as well.

And who can forget that by having these smart features that means that the fridge has more systems that can (and will) fail so that you'll have to replace the fridge (or pay for costly repairs) when they do. Or the features will stop working after a certain amount of time due to a lack of security updates.

"Some features have been disabled due to your product reaching EOL. We're sorry for the inconvenience."

Smart appliances are not the future we want.