Roblox has a strict DMCA policy. If you take an exclusive uncopylocked file built by "User A," change the color of the roofs, and upload it as your own paid game pass or showcase, you risk a permanent ban. The community is small; creators talk.
Many "exclusive" park layouts are showcased by creators like Thijmen0808 theme park tycoon 2 uncopylocked exclusive
Create their own custom versions or "spinoffs" of the game. Roblox has a strict DMCA policy