The actual sign up link for this program can be found
here.
While the idea of receiving a free Mavic Air sounds incredible, those who receive one will need to complete some unknown tasks in order to keep it. Here's what the details of the offer state:
"Chosen applicants are required to sign an "Equipment Loan Agreement" before acquiring a trial Mavic Air. By signing the Agreement, they are obligated to complete specified content tasks required by DJI. If the quality of content tasks exceed the standards set by DJI, users may be allowed to keep the trial Mavic Air, free of charge. All other users will be required to return their trial Mavic Air by a specified deadline. For more details, please refer to DJI specialists and the Agreement."