"If you visit githud, the password manager won’t prompt you to use the login details for github."

I guess you're talking about password managers like 1Password circa 2015 when they did an affordable lifetime license. Yeah that was a quaint feature. Now with the monthly fees, I have no idea what they're doing and it irks me to no end. I mostly must search for the site on my own and let it fill in the credentials, leaving me wide open to attacks like this. Massive regression.