Too many assumptions and some misrepresentations. His first day when he meets Antonio and Isabel, Antonio says to him:
"But, you don't have to worry. You will not be forced into anything you feel uncomfortable with, I'll personally make sure of that."
So everything the MC does is HIS decison, even so far as if he does any work at all. Now that obviously also cancels the 'servitude' part, even if we choose to ignore the free room, food, money and that he can go anywhere he pleases whenever he pleases.
When the MC goes on the Straffan mission, Antonio says to him "If you feel it's too much for you, take a step back." So really don't think there is much forcing the MC going on.
And to make an educated guess if the Deluca family should "burn" for it, we would first need to know the why. What if there was an age barrier, let's say as soon as he is 25 year old, MC-hunting season begins. He wouldve been deader than dead 10 times over, if the Deluca's wouldn't have taken him in and protected him. We have no clue whatsoever why anyone is out to kill him, and untill we do, we can't judge anyone involved on their motives.
The game even goes so far to have Wilfred blame Cordia for not just locking the MC in a room and throw the key away, but Cordia doesn't want to do that to him, she instead wants him to be free.
So untill we know more "burn the Deluca's" might be too extreme or just plain wrong, we need more info first.