I have tried to chop wood with an axe, it needs a lot of skill, same is the case with knives, saw etc.It takes brute force.... Removing limbs, parts of a body isn't that hard... All you need is force and the proper tool.... An Axe(cleaver) or a saw suffice.. force isn't a skill. .
May be (not sure), the question is, how poor, & how many.There will always be rich and poor? Like... Forever?
Not everything can be freeIf everything is free? And someone steals? lol... Then you laugh, because it's free....
Edit: I forgot, amputation is the final punishment for stealing in Islam, not the first. Other than stealing, there is a long list of prerequisites that need to be fulfilled in order to declare somebody eligible for amputation. Like he shouldnt be needy, blackmailed, mad etc.