Sadly there is no guarantee with this marketplace, or any other. Steam did not compensate any devs when they banned and removed games there either. Knowing how digital marketplaces, payment processors, and usage licensing works will go a long way to understand how this wouldn't be a thing here, nor any other marketplace.
Many people do not understand the underlying issue with what is going on. Processors (VISA, Mastercard, PayPal, etc) have told Itch "do not allow people to buy things we do not approve, or we will not process ANY form of payment for ANY reason". With limited resources and not having the backend systems to comply immediately, they de-listed everything as a stop-gap measure while they formulate and implement a plan. Unless things change, on the legal and political stage, some games will be banned/removed from the platform, just as it has happened recently on Steam. Itch cannot afford to lose the ability to process payments on the entire platform.