By tipping at large scale customers are showing support to the business model. If you worry about future that model is setting, last thing you want to do, is to ask others to help support that model.
By tipping you are directly subsidizing doordash
Not if they can't find other work (like now where un-employment is high).
- the opponent will flee or - the opponent will fight to the death
Don't you think that would affect the attacking party's plans?