MLB took over the Diamondbacks broadcasts as Bally Sports parent Diamond Sports Group missed a payment to Arizona:

Fans in the Diamondbacks’ home television territory — who were previously blacked out from watching games on MLB.TV — will now be able to subscribe to that service for $19.99 per month or $54.99 for the remainder of the season. That territory includes all of Arizona, New Mexico and Utah, as well as parts of southern Nevada.

AZCentral.com

And another blackout disappears. I hope Diamond keeps defaulting, and no blackouts becomes the default.