Singular or plural with "None" here?

AlpheccaStarsFirst, language used for special purposes is often very different from everyday English. Language that is over 100 years old can use vocabulary which today is outdated. Language that is one of the colonial dialects (Indian, Australian) has developed its own unique style and vocabulary. Language which is selected from a combination of these traits is often difficult to understand.

Ah! The Brits and non-native speakers can say the same thing about American English . Not joking we do sometimes feel difficulty in understanding American idiomatic usage in their language. English language wherever it is spoken or used is a bit influenced by local dialects, so there is nothing to complaint about. But thanks for getting my question at last!!

AlpheccaStarsAll games of cards (All card games) are now judged to be gambling, that is, games of pure luck or chance. None of them require the players to have special skills.

Yeah, you got it now. Now also answer/explain why "none" is taking plural here? Why no need to pluralize the word "involve"? Does not singular is often used with none?

Anyone can answer.

Thanks