Fascinating - do you know if it's possible/feasible to do this if you're doing projects and contract work? Any ideas on what kind of view is taken of offering s

Fascinating - do you know if it's possible/feasible to do this if you're doing projects and contract work? Any ideas on what kind of view is taken of offering some long term support/warranty/guarantee and taking your earnings over two years? Any articles or insight would be very much appreciated.