Are there any protections for the initial investors for subsequent funding rounds, when their share could potentially be diluted to 0? I'm still a bit leery of

Are there any protections for the initial investors for subsequent funding rounds, when their share could potentially be diluted to 0? I'm still a bit leery of this idea of fundsourcing, because it sounds like a way for retail investors to fund the most dangerous and riskiest round, and then once a startup has traction, VCs can come in with a lot of money and dilute the initial investors with impunity. Is this a possibility, or are there ways for these initial investors to protect themselves?