How? The startup still need VCs for funding.
If I were a VC, one gripe would be that it might hurt a founder's motivation. At 1% of a founder's equity, it's not so much that they're not working to make the next big thing, but in the back of their mind, they know they might get $1M for it. My other concern is that this almost freerides on the VC model. It's a way for a founder to get the benefits of being an LP, but without the fee structure.