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Etihad used to give a free hotel on business class awards (along with free chauffeur service) but now it is only available for paid tickets.
Doesn’t matter if you are on an economy, business, or first class award.
See below.
https://www.etihad.com/en-us/abu-dhabi/stopover
etihad.com
Extend your holiday with a stopover in Abu Dhabi, the city we call home. Take advantage of free hotel nights and experience amazing Abu Dhabi with Etihad.