None in my use of the service.

To my knowledge, they make money because they act like a credit card (they collect cc fee from the seller), but actually just proxy the charge to your bank account. You basically lose out on any your own cc rewards though since you can't proxy to another cc (then they would lose their profit margin paying your cc provider).

Personal example of when I found it useful: I used a burner card from them to buy a board game online, turns out the site was hacked, leaked the card info, additional charges were attempted but failed because the burner card settings only allowed the original charge through. Was really glad I didn't use my own cc.

Unfortunately if one must supply privacy.com with access to a bank account, it's not an improvement over Etsy in terms of exposure. And with Etsy you can directly supply a credit card, leaving your bank account isolated.

I use privacy.com with a completely separate bank account account with a limited amount of funds. I think that it works well enough.

I use separate bank accounts for various isolation purposes, but they generally have a monthly fee when below a substantial balance. Direct deposit accounts are the exception in my experience, and one doesn't generally have multiple direct deposit employment sources.

If I need to setup a separate account to isolate privacy.com's use, why wouldn't I just make it a Citi account and use their virtual cards instead of providing all my identifying information to yet another third party open to hacking and diminishing of corporate values?

Because I don't use a browser that supports flash.

Capital One also does but apparently it requires you install a browser extension that you give permission to spy on all webpages.

Are you sure that's not just an optional convenience thing?