That's pretty revisionist as to the actual reality. The vast majority where incredibly overvalued internet plays on traditional markets, exactly what the gp warns. You just picked one of the few that survived and thrived. Don't overestimate how inevitable it was that we ended up with the Amazon we see today.

The biggest difference I see this time is these unicorns have actual revenue. Heavily subsidized but revenue still. Last time we had monster companies that didn't even show that given 2 dollars they could make 1, so progress?