I use it for everything.

I have unique/monthly limit cards:

  * My kid's swim class has a unique card.
  * Wife's phone (setup before Google started rejecting their cards)
  * Cable bill
  * Netflix
  * Personal AWS bill
  * Gymboree
  * Monthly self-storage

Recently closed one-time cards:

  * Online grocery order
  * Delivery food order (leave some padding for tip)
  * Online clothing retailers
  * Charitable donations paid via CC
  * Tickets to DisneyWorld
  * Every penny that goes through PayPal because I don't trust them for a second

Literally, anything that we pay for over the phone or online.

One place I'm especially happy to have it is my vet. They're really bad at billing. They've double billed me twice. Now I keep a dead card on file (they want a card) and give them a new one with a hard limit every time I have to pay a bill. No more double billing and I can see when they're screwing up.

Not the parent, but I can give some uses of my own.

* All kinds of recurring payments. I pay for email, Dropbox, Patreon, and my VPS with cards that have monthly or yearly spending limits.

* One time payments everywhere I don't have an account and don't want an account. I had to pay dues for a university club recently and I went through a super sketchy university website and payed with a burner card. 3 months later I get a "rejected transaction" email from Privacy telling me that someone tried to use my card at a Walmart. This isn't a common occurrence for me but it was nice to not have to cancel my real credit card.

1. If I want to subscribe to something that could have a recurring payment, I use a burner card to make sure that the recurring payment won't go through.

2. Less often, I use it if there's a trial that catches my eye but I don't want to give them my actual info. I use a single use card in this case.

3. On perhaps less reputable sites where I certainly don't want to give my info. Again, I use a single use card in this case.

4. I use it across all my subscriptions because I can easily see how much I'm spending in a given month (specific to subscriptions).

The cap and single use is the one of their best features; you can assign it any value you want and if it hits that, it won't allow other transactions.

While I'm not familiar with it, I've heard that Citi cards also have the same Virtual Accounts, so you could use that as well.

My most common use-case is SaaS trials that require a credit card upfront – I set the limit at $1, so I don't have to worry about cancelling my trial before they autocharge me.

Allows you to have a cap on any card you create, so you have protection against getting overcharged or if you want to help someone out with purchasing something, you won't give them your original card right? Create a privacy credit card, have a cap on it and give it...etc

I use it frequently too (the chrome extension is great). Best use case is using temporary cards for subscriptions or sites you don't use frequently and don't want to give out your actual credit/debit card.