I think he makes a good point in the video (the first one) : If you answer to these eMails and have some fun with them, they have less time to scam people who might actually fall for it. Usually these eMails are in my spam folder, but I might try to setup an eMail account for this at gmail, protonmail or any of the other free services, and have some fun. If only a small percentage of the receivers of such spam eMails would do that, they would soon quit doing this.
PS: if you do this, make sure to hide your identity very well, they are criminals and might have friends in your country which can be dangerous if they are upset. So e.g. if there are any numbers or other unique things in the initial eMail to you, don't include this in your reply, so that they can't associate your original eMail address and name (just in case, I doubt they are that smart) and of course, never tell them anything which could help them to identify you, and don't phone them (except maybe with a disposable pre-paid mobile phone). Best would be to get these spams to the new eMail account, so enter the eMail to any "free iPhone" etc. site you can find.