You don't need to buy into the "Bitcoin will replace the U.S. dollar" narrative to buy $5 worth of bitcoin to send a few hundreds or thousands of emails..
No one goes to an arcade wanting to play a game and says "I don't know about these tokens, though..."
You buy bitcoin somewhere (if you can't figure this out yourself you arent trying)
And send it to whatever address this app provides to you..
I am unsure whether you could use e.g. Apple Pay to pay directly, or if you’d have to follow the microtransaction playbook to buy a greater amount of currency which you can spend.
The more detailed answer on how this works can be found by going to the site and clicking "How It Works"
1 Someone Emails You 2 The Gate Catches It 3 Sender Sees the Payment Page - The sender clicks the payment link in the reply. They see exactly what's being held and what it costs: 4 Pay with Lightning — 15 seconds 5 Email Delivered