does everyone who raised from ftx ventures need to return stolen customer funds?

I wouldn't think so. There's no legal requirement for startups to buy back their shares if their counterparty goes bankrupt. More likely, the equity owned will be sold to a secondary buyer for a discount from the paid price, and then that cash would be used to pay off liabilities.

Founder of venture DAO Chainforest (www.chainforest.xyz). Also treasury Co-Lead @ FWB. Liftcaster. Fashioncaster. Dadcaster. NYCaster. NBA Caster.

you’re right https://www.theinformation.com/articles/in-ftx-bankruptcy-startup-stakes-could-be-sold-off-fast