We have actually removed the "Deals" article alerts altogether. After the recent changes in news articles (Changes log - 17 July 2022), the full list of games on sale is included. This would result in an insane amount of notifications, therefore we got rid of the Deals alerts.
However, you can still set up alerts for other news categories: Bundles, Freebies, Giveaways & Subscriptions.
If you believe that these notifications should also be disabled by default, you can still vote on this topic. However, I don't think it's necessary, as such notifications are very rare.