Don’t pay the guys on G2A for keys - they’re just reselling stolen corporate MAK keys. They’re also not legal to the terms of the EULA, so it’s not a ‘genuine copy’ for the buyer either - you may as well just use Massgrave instead of funding crooks.
To add to your list of options: you can also just leave it unactivated forever.
It’ll whine about requiring activation with a ''Activate Windows. Go to Settings to activate Windows" message overlaying the bottom right corner of the screen - but that’s it, functionality is otherwise 99% unaffected (you can’t change wallpaper… Oh no). For Windows 10 it will now stop offering updates though - same as any standard Win10 copy, so I’d again recommend the Massgrave Dev route to keep the updates coming a few more years.




WEP is insecure - that’s why it’s not used anymore.
Quite different to a secure protocol that has had some manufacturers leak keys due to poor security practices.