Scraping emails via glitch

A competitor has a possible glitch on their website. When I follow the "unsubscribe" from one of their emails, I am taken to a URL that looks like this:

https://x.x.com/subscribe/1670699

By changing the last number, I'm able to see the email of the account that is subscribed.

How can I take advantage of this glitch and scrape all 1670699 emails?

Thanks.