Bradley Tusk, co-founder and managing partner at Tusk Venture Partners, believes that the traditional venture capital (VC) model is dead.Due to higher-interest rates, crashed startup valuations, and stymied IPOs and M&A transactions, VC has been struggling in recent years.Instead of raising a fourth fund, Tusk has decided to shift focus to an 'equity-for-services' model.Tusk believes that he can make more money with the equity-for-services model as compared to the traditional VC model.