Ask data is now available to all users meaning viewers can benefit from curated insights alongside the flexibility to ask their own questions either using the new Lens system, using it inside of a dashboard and lastly using it on a published data source you could before.

Tableau release notes:

"We’ve broadened the reach of Ask Data by making it available to Viewers. Everyone with a Tableau license can now use Ask Data! We have a completely redefined natural language experience for business users, including seamless integration into dashboards with a new dashboard button. Additionally, a new content type, Ask Data Lenses, makes it easy to curate data with the definition of column and value synonyms and suggested questions so you can better leverage existing published data sources."