I don’t think this is possible without alt codes on standard Windows configurations. MacOS has shortcuts for them and Linux has them too (if you have compose enabled, which is disabled by default).
Works on phones through the special character input. Sometimes. Depends on your language, location, and keyboard of choice.
Seems rather unnecessary and pedantic to tell others to use it, though. This is a forum, not a thesis.
Someone needs to curate and maintain the blocklist. Paying for software once is a surefire way to have it stop blocking anything a few years down the line because the company stopped updating their lists when the sales ran out.
If you pay a set fee for something that requires continuous maintainance you’re either overpaying enough to compensate for cash flow interruptions or you’re at risk of the software being discontinued. The latter is especially true if you’re getting stuff for free, but in that case you’re also not entitled to any service.
As for “why not block teamviewer at the router”: because then anydesk will still work. And if you block anydesk, Microsoft Remote Support will work. And if you block Microsoft Remote Support, RustDesk will work. And if you try to block every single RustDesk server, grandpa’s internet probably no longer works anymore, because you’ve just blocked off every data center in the world.