Shift+Ins was the default paste on Windows 3.0, before Apple sued Microsoft for copying their OS (back in then it was still called just “System”), so MS added Ctrl+C for Windows 3.1, but the old one still work.
Same thing for Xorg. Ctrl+Ins for copy, Ctrl+Del for paste and Ctrl+Ins for paste.
If too many people do this, you bet “smart” TV peddlers will start bundling cellular modems on their devices, so they can connect directly to their servers without relying on your WiFi, just like car companies do. Blocking this would require enclosing the TV in a Faraday cage.