I would have to see something backing that up since unpaid internships would not be just the province of the well off and employers would have some incentive to

I would have to see something backing that up since unpaid internships would not be just the province of the well off and employers would have some incentive to raise wages where I don't think UBI would do that. You also assume for every $ I get from work would be deducted from my payment which isn't true for a lot of negative income tax schemes.