Following this, an idea I’ve had for years without any ability to act on is a smart TV replacement board that’s sold alongside adapter boards for various popular models of TV that handle differences in power, display connection, etc, making dis-enshittifying one’s smart TV as easy as upgrading the GPU on a computer tower.

You could have 2 tiers of board: Essentials, which is cheap and only has as much hardware and software as is strictly necessary to produce a pre-smart-TV experience, and Deluxe which would be pricier and built around a recent flagship SoC (e.g. Snapdragon 8 Gen 1/2/3) with an unlocked bootloader and preloaded with Android TV.