

When I was in college, I rented a house just outside my budget and found I couldn’t afford things like cable internet.
I had a wifi->ethernet bridge that was originally to connect my OG Xbox to a wifi network. I also had neighbors with Wifi using WEP encryption. An idea was born.
Was able to use aircrack-ng on my laptop to crack their WEP key in about 15 minutes. Plugged that key into my wifi->ethernet bridge, and then hooked that into my router. Bam, my whole house was online.
That worked for probably a year and a half.
AFAIK, yes. Though I haven’t tried it with WPA3.
While WEP is dead, you can still use it to capture the WPA/2 handshake and run it through something like John the Ripper to try to recover the passphrase.
Admittedly, I haven’t messed with it in years.
Either way, you still need a wireless adapter that’s capable of promiscuous mode as well as a driver for it that supports packet injection (not sure how rare that is nowadays).