Just to note, Universal and SeaWorld both do reside in some sort of District, so Disney is not alone, their Districts aren't as broad, as explained here in this article:
Does the state treat all theme parks this way?
Local governments have given some special privileges to Disney’s theme park competitors. But none approach the state’s arrangement with Disney.
Universal Orlando sits in a portion of a special district called the Orlando Community Redevelopment Agency. A portion of the property taxes paid by Universal that would normally go toward general government are used to pay for public infrastructure improvements near the park. Local officials created the Universal portion of Orlando’s community redevelopment area in the 1990s to ease congestion around Interstate 4.
“Does Universal benefit from those infrastructure improvements? Yes, because they can get more visitors and a better experience for their tourists,” said Chris McCullion, the City of Orlando’s chief financial officer. “At the end of the day though, had we done nothing, I-4 would just be a parking lot around Universal Studios.”
SeaWorld also sits within a special district. But the two Tampa parks it owns, Busch Gardens and Adventure Island, do not, according to the Hillsborough County Property Appraiser’s Office.
Article:
https://www.tampabay.com/news/flori...districts-like-disneys-reedy-creek-explained/
The ongoing Kirkman Rd extension for the Epic Universe is being funded by three parties: a little bit of grant money from the state, Orange County (most of the funds are supposed to come from the Orlando CRA), and Universal.