"We're reaching out to let you know that Curse Media will be joining the Fandom team. We are excited for this new opportunity to grow and improve your favorite sites and services.
So that you can keep enjoying Curse Media after the transition, we are asking for your consent to transfer your account terms and personal data associated with your account to Fandom to the extent they relate to Curse Media. You will be unable to access your account on Curse Media sites/services after the transition, unless you provide consent. You can provide consent by clicking the link below, or you can learn more by visiting here (or the link below corresponding to your preferred language). Providing consent will not impact your existing relationship with Twitch in connection with other Twitch Services."
And even more by keeping a profitable company under their umbrella. Probably, this move was something Curse wanted, and twitch/amazon just didn't care as long as the price was reasonable.
Won't change your twitch integration, according to the stream linked in the OP. Twitch will remain linked to DDB, and you can still use your twitch login to authenticate your DDB access, or you will be able to use other authentication avenues like google or facebook.