Does it matter? The point is that fax isn't inherently a great idea for confidential info.

There's also the issue that many fax endpoints that are fax to email gateways. Or fax to non https website gateways.

Edit: Nobody is arguing for using email instead of fax. The argument is to use something better. Like paypal or stripe instead of full cc info + cvv2 on a piece of paper.

The context is that companies that continue to push fax could, and should, do something better. The manufacturers I mentioned, for example, could implement paypal or stripe payments with very little effort. Aside from security issues (fax to email gateways, cc info sitting on a shared fax machine for everyone to see), it would reduce costs.