Judgmental much? It might surprise you but most people eat things they enjoy that are not healthy.

How is ordering from the web any more or less of a security risk than an app? They are both probably using the same backend system and API.

But, I am very careful where I put my debit card. I use a credit card for almost any untrusted payment. Yes you can dispute both, but the money isn’t coming out of your account with a credit card.

The number of single vendor cards that I'd need to carry would be enormous. The idea of moving away from credit cards (inherently long lived payment authorizations) as a payment system is fabulous but in the meantime your idea is probably not realistic.