I mean git is also trustless and decentralised

git is trustless to the extent of vc purposes. it is not trustless to the level of financial accounting. for example git has no concept of double spending, while in a blockchain there is (usually?) no concept of branching and merging. but you are right in that they are both based on merkle trees

Double spending avoidance cannot happen without a financial incentive ie currency is what I meant

> Double spending avoidance cannot happen without a financial incentive ie currency

the incentive (reward) is to make decentralized and trustless booking keeping possible, not the other way around