If you can be locked out of it remotely, you don't own it.

On May 3rd, 2019, the Microsoft-resembling extension signature system of Mozilla malfunctioned, which locked out all Firefox users out of their browsing extensions for that day, without an override option. Obviously, it is claimed to be "for our own protection". Pretext-o-meter over 9000!

BMW has locked heated seats, a physical interior feature of their vehicles, behind a subscription wall. This both means one has to routinely spend time and effort renewing it, and it can be terminated remotely. Even if BMW promises never to do it, it is a technical possibility. You are in effect a tenant in a car you paid for. Now imagine your BMW refused to drive unless you install a software update. You are one rage-quitting employee at BMW headquarters away from getting stuck on a side of a road. Then you're stuck in an expensive BMW while watching others in their decade-old VW Golf's driving past you. Or perhaps not, since other stuck BMWs would cause traffic jams.
Perhaps this horror scenario needs to happen once so people finally realize what it means if they can be locked out of their product whenever the vendor feels like it.

Some software becomes inaccessible and forces the user to update, even though they could work perfectly well. An example is the pre-installed Samsung QuickConnect app. It's a system app like the Wi-Fi (WLAN) and Bluetooth settings. There is a pop-up that reads "Update Quick connect", "A new version is available. Update now?"; when declining, the app closes. Updating requires having a Samsung account to access the Galaxy app store, and creating such requires providing personally identifiable details.

Imagine the Bluetooth and WiFi configuration locking out the user because an update is available, then ask for personal details. Ugh.

The WhatsApp messenger also routinely locks out users until they update. Perhaps messaging would cease to work due to API changes made by the service provider (Meta, inc.), however, that still does not excuse locking users out of their existing offline messages. Telegram does it the right way: it still lets the user access the messages.

"A retailer cannot decide that you were licensing your clothes and come knocking at your door to collect them. So, why is it that when a product is digital there is such a double standard? The money you spend on these products is no less real than the money you spend on clothes." – Android Authority ( https://androidauthority.com/digita... ).

A really bad scenario would be if your "smart" home refused to heat up in winter due to "a firmware update is available!" or "unable to verify your subscription". Then all you can do is hope that any "dumb" device like an oven heats up without asking itself whether it should or not. And if that is not available, one might have to fall back on a portable space heater, a hair dryer or a toaster. Sounds fun, huh? Not.

Cloud services (Google, Adobe Creative Cloud, etc.) can, by design, lock out the user, since they run on the computers of the service provider. However, remotely taking away things one paid for or has installed on ones own computer/smartphone violates a sacred consumer right.

This is yet another benefit of open-source software: someone with programming and compiling experience can free the code from locks.

I don't care for which "good purpose" these kill switches exist. The fact that something you paid for or installed locally on your device can be remotely disabled is dystopian and inexcuseable.