This can also enable consensual advertisement; 

You can have a proper ad inside your voucher’s main page. Users will also get paid for it. I can see some interesting use cases. nostr:note1pwq7uj2lq7pn4xw5l94ugr0swa2rz0chmzlax7pjk3ytcr8a0tzsvm9290 

 & don't worry, It will be bot proof. Also no captcha. 

 The future is now