If you use the service, you need to tip, otherwise the workers are screwed. If you don’t support the model, don’t use the service. Don’t be an accelerationist; real people get hurt in its intermediate phases.
You or I might have to privilege to choose our next jobs but for some people especially those in the services industry don’t have that and end up having to work doordash/instacart. Don’t attack the messenger when it’s probably easier for most people to stop using doordash.
Given that we arent going to be convincing others to tip or not to tip, id argue by not tipping you are not "part of a movement trying to take down doordash" but just being cheap (if in the US where there is a culture for this)
The companies are required to pay their workers at least minimum wages if wage + tips is less than minimum wage. As far as I can tell, tipping is justified by guilt-tripping everyone by saying "the food industry doesn't pay its workers enough so it's your responsibility to make up for the difference" instead of saying "the food industry needs to pay its workers a real wage and give customers the real price". If tip is not optional, then make it not optional, but don't guilt-trip people into feeling required to do something optional.