A refinement might be something like a "Employees of YC Winter 2019 Class" syndicate, which might be even more employee-friendly, due to the diversification factor, and might alleviate some social concerns internal to a company.
Most employees are probably over-exposed to the future of their company by both equity ownership and the implicit current value of their future career prospects both being a) heavily correlated to the company and b) very large relative to wealth.