The problem with basic income is it transfers the source of the paycheck from a company to the government. Right now, if I have an issue with my paycheck, I can go to the government for recourse. If my paycheck comes from the government, how do I achieve my check and balance?

Also, it's already been established that Silicon Valley is not so happy with the government, so displacing an entire working class and making them dependent on the government would grant the government a power that seems against SV's interests.