They often require you to "register" or log in with your own Facebook details, which are then stolen by the scammers.

Legitimate hacking tools do not exist in the way they are portrayed in these ads. Here is what usually happens when you try to use "v290" or similar software:

Let’s say you ignore the warnings and download the tool anyway. What happens next?

No. Those videos are edited or use fake login screens. Many are simply scams to drive traffic to malicious links.