Vitalik was talking about token sales that give discounts to large buyers. And that they can be circumvented via collective-buying smart contracts.

I got that information by reading his tweet.

Frankly, I don't know what you're talking about. I would imagine if he was trying to convey one should avoid all token sales he would have said something similar to that. Not something specific to a specific situation.

The trick I'm employing involves reading comprehension.