Native raised venture capital, it wasn't disclosed but there's plenty of PR surrounding it.
Tuft and Needle was started by engineers that had a good bit of personal cash saved in the bank, then later borrowed $500,000.
MVNT raised Money.
It's not like these companies didn't raise a bunch of money, they just didn't use VC $$ supposedly.
The common denominator here is the direct to consumer model with the use of growth hacking via social media campaigns and the rise of such social media platforms.
I.E. Make product that people want to buy and market it efficiently on social channels.