The terms they are pointing out here are basically the same as you'd find in any equity financing post seed round. Seems strange to flag such common terms as evidence that there's something strange about these high-valuation financings.
+1 - I would say this reports deviates almost zero from any priced round I've done. All get 1X liq. pref, usually not-participating.
In fact, the only times I've seen participating or more than 1X preference is during a down-round or for a struggling company, aka. the opposite of a unicorn.
The terms they are pointing out here are basically the same as you'd find in any equity financing post seed round. Seems strange to flag such common terms as evidence that there's something strange about these high-valuation financings.