Buying Amazon in the 90s is analogous to buying Berkshire in the 70s. It would have taken a prescient and outsized allocation decision which, ex ante, would have been difficult to justify.
A very large number of people were buying Amazon and the other internet stocks in the 90s. If not, there wouldn't have been a bubble. The part requiring the magic genie would be not selling it for the next 20 years... :)