How to perform a mass charge back against a business?

You can't perform a "mass charge back" across independent events. (And from the description, they really are independent, though they may add up to an overall quality of service issue.)

The bank may favor its customer. But they are likely to look at an ongoing pattern of charge backs as attempted fraud. If you think that is necessary, you should have walked away long ago.

You could try taking it to small claims court, assuming you have contemporaneous documentation for every incident. I think you'd get laughed out of court. If you were dissatisfied with the service you should have said so immediately, dealt with that incident, and if not satisfied stopped using that service. The fact that you continued using them will, again, probably be taken as evidence that you were satisfied, if less than happy.

Next time, stop using vendors whose services you aren't happy with. If that leaves you with no acceptable delivery services maybe switch to restaurants who do their own delivery; there still are some. Or go pick it up yourself.

(You have been complaining to the restaurants as well as the delivery service, right? Sone of what you have described is clearly their responsibility to fix, and for the rest they would want to know that a delivery service is being sloppy so they can (threaten to) stop doing business with them and switch to another. That may carry more weight than a customer complaint.)

Chargeback is a valid tool, but it isn't a bulk tool, and it isn't a panacea. Sometimes you just have to accept that you aren't satisfied, take a small loss, and go elsewhere. If you keep playing after you have decided the deck is rigged, that's on you.

How to perform a mass charge back against a business?

Simple: call your CC company and ask.

Tl;DR but worth the read

You're only as successful as you are assertive.

Many of the things you bring up seem covered per https://tb-static.uber.com/prod/udam-assets/drclg/Order-AccuracySP-01EMEAV4-GBen.pdf; especially the spilled beverage.

I am amazed there isn't a class action lawsuit you can join since Uber Eats is not upholding their end of the contract.

I can only assume bags are typically sealed these days so drivers have no way of verifying your order. I assume you don't want them disassembling your sandwich to check for extra pickles, right? Are you given the option to instruct the driver to check your bag for order accuracy?

Drivers are barely paid a living wage as-is; I believe they are under zero obligation to make sure your order is right. They are merely bringers of food from point A to point B. Check out https://www.reddit.com/r/UberEATS/comments/9nw5k3/arethedriversresponsibleforvalidatingorders/

Realistically, the refund/dispute process probably costs more than the refund is worth. I am sure that department is deliberately understaffed so that Uber Eats keeps more of their money.

$100 of undelivered food in a single order is quite excessive. I can't believe they did not resolve that in your favor.

Dragging your credit card company into this so late in the game is tricky. You can certainly call and they will tell you what they need from you in order to file a dispute properly. You may be limited to issues within the last 120 days. You will likely have to provide proof that you tried resolving it with the company directly before the CC will act on your behalf.

The whole situation is stacked against you. If you complain to the restaurant, they will claim Uber Eats is responsible for the resolution. If you complain to the driver, they will say the restaurant got it wrong and they aren't paid to verify things. If you complain to Uber Eats then they will try their hardest to deny you and chalk it up to attempted fraud. If you dispute with your CC then they will wonder why you keep using the service in light of frequent dissatisfaction.

This paradigm reminds me A LOT of the airline-passenger relationship when the passenger books through a travel agent; the airline basically becomes 100% hands-off in the event of any changes to your ticket: missed flight, delay, rebooking, cancellations, etc...