Why is it my responsibility to ensure they’re paid fairly by me directly?
Because the price you pay for a service is a reflection of the relationship you have with the person providing that service, and to believe otherwise is something known as commodity fetishism
"What is, in fact, a social relation between people (between capitalists and exploited laborers) instead assumes “the fantastic form of a relation between things.”
We are defined both individually and societally by the relationships that we form with other people.
If you can’t pay your workers fairly, why does your business deserve to exist?
It does not deserve to exist. However, it does exist, drivers drive for them and are not paid enough for their labor, and you continue to use it despite all of that. I’ll ask again: why don’t you personally be the change you want to see in the world and pay them more now?
Man, I don’t know what you think we’re talking about, but I’m talking about DoorDash and DoorDash drivers in reality as it is today. I do not own DoorDash, so you are not subsidizing my business. The service offered is just bringing your food to your door, there isn’t really any “good” service that can be used to justify a tip or vice versa. If people decide that the cost of a DoorDash delivery plus a tip is too much, they won’t close the app and go get their food themselves–they will just not tip like OP did and like you do and they will both receive a message like the one above. If you want to have your order picked up quickly, you have to place a winning bid.
THAT is what capitalism is–not some idealized pursuit of profit that refuses to exploit its workers; but a house of cards built out of dozens of competing contradictions, full of people hoping to leave someone else holding the bag when it all comes crashing down. I recommend reading Contradiction 7 of Seventeen Contradictions and The End of Capitalism, “The Contradictory Unity of Production and realisation”. It’s all about how capitalists are fighting the competing contradictions of wanting to sell their goods for as much as possible while paying their laborers as little as possible, and what the broader social impacts of that may be.