[belorn]

When ever people mention the Tivoization clause they forget to include the big exception which the license gives. You do not need to give your users the ability to install a modified version of GPLv3 software if there is no mechanism for which the manufacturer can modify the software after sale.

People can create any number of embedded system which are locked down so no one can change the software. The key here is nobody. Not the user, not the manufacturer, not some backdooring third party.

People are free to argue that allowing manufacturers access to devices after sale but not the actually owners is a security feature to prevent botnets and pwning, but that is a harder sell.