Microsoft has removed the limited release restriction for Excluded content terms within its Microsoft Advertising platform. Advertisers can now block ads from appearing alongside unwanted page titles by specifying up to 1,000 terms at account or campaign level. Campaign-level terms apply across all campaigns in the account.

Previously, the Excluded content terms feature was not widely available. A banner on the Brand safety help page indicated its limited availability, which has now been removed, confirming wider access.
Read the official help page here: About content suitability.
This update was spotted by Hana Kobzová.