Most real estate crowdfunding sites offer access to investments into commercial real estate - usually the debt component of development projects that institutions are not willing to fund. There is a "sponsor" who collects fees. There is operational risk and vacancy risk.
Vessel involves investments into specific single-family homes, often owner occupied. There's no operational risk since there is usually no development planned; there's no vacancy risk because the income comes from payments owed by the homeowner irrespective of income the property generates. The investors are exposed to appreciation upside.
Real Estate Crowfunding