Fabrice Grinda says he never intended to run a venture firm. He just really (really) enjoyed angel investing. In fact, by late 2013, when he was on the verge of selling the global classifieds marketplace OLX — his third business — he says he had already written checks to more than 150 startups with his longtime friend and OLX cofounder Alec Oxenford. “We’d been working together forever. It was really a family office that was angel investing at a massive scale,” Grinda recalls.