Weber: "Unrestrained" capitalism?

In view of the election of a Labor leader who's been abusing "unrestrained capitalism", this remark from the intro to Weber's Protestant Ethic and the Spirit of Capitalism is interesting:
"Unlimited greed for gain is not in the least identical with capitalism, and still less its spirit. Capitalism may even by identical with the restraint, or at least a rational tempering, of this irrational impulse".