Taskrabbit is very much on the side of the money. It does little to protect its taskers from the whims of the public who use it.
Clients are free to leave negative reviews full of lies and taskrabbit will not change them, even when presented with clear evidence of the lies.
Clients are free to choose incorrect categories of work and then just write a completely different list of demands. For example, they can select "delivery" (intended to be delivery of small items such as clothing or food, as specified by taskrabbit itself) but it will actually turn out to be a full house move. There is no penalty to the clients for this.
Clients are free to add extra tasks on the day and make extra demands not agreed upon, if you (as a tasker) decline, you are subject to negative reviews even though the client breached the agreement.
When jobs go well, this app is a dream, when they don't; it's a nightmare.