The Lead Investor vets a startup and decides to personally invest.
When investors on Wefunder invest more money on those same terms, they share 10% of their profits of their investment with the Lead Investor and the XX Team.
In return, the Lead Investor is responsible for directing the vote of all investors on Wefunder, and the XX team helps the startup grow in value. The startup only has one entity on their cap table: XX Investments LLC. The founder must only get the signature of XX Investments (as directed by the Lead) to authorize any corporate actions.
It works much like an AngelList Syndicate Lead, except the legal structure is not an investment fund. Instead of an SPV, an SEC-registered transfer agent serves as a custodian. The outcome is the same: one entity on the cap table and a single Lead to direct the signing of any corporate documents and the voting of the securities.