Yes, on January 23, 2023, they sent a e-mail:
"Subject: We’re switching to paperless bills
We're going paperless
Hi x,
We’re excited to let you know that starting 2/21/2023, DISH is transitioning you to paperless billing - a more convenient and reliable way to pay your bill while decreasing environmental impact.
If you’re already enrolled in AutoPay, your payments will continue to auto-draft from the card or bank account you selected. This change will also not affect your ability to make online payments.
If you would like to continue receiving a paper bill, just let us know by selecting the button below. Otherwise, all of your future bills will be paperless and delivered right to your email."
I didn't see this until a week ago as I haven't read e-mails regularly since 2016 and I wanted to opt-out as I prefer to receive a paper bill since I normally do the payments by credit card manually and use the bill to actually write in the payment information along with the confirmation number.