Ross Perot's Electronic Data Systems was doing this to programmers, etc., back in the 1970's, IIRC. The required repayment if you quit too soon was quite high,

Ross Perot's Electronic Data Systems was doing this to programmers, etc., back in the 1970's, IIRC. The required repayment if you quit too soon was quite high, less than a year's wages, around the price of a new car, for the people I talked to who were working there.