You're already too worried about it. You have a better chance of getting struck by lightning than having your stroller stolen. And good luck finding the thief if does happen. As others have said, there are thousands and thousands of strollers at Disney every single day and 1 or 2 people on a message board say they know of a stroller theft that happened in the last 10 years but can't prove that the stroller was intentionally stolen or mistakingly moved. So tie a unique scarf to the handle of your stroller, put an Airtag in it (but realize that thieves know to look for those and toss them aside), and don't leave valuables in it when you go on a ride. You're so worried about it happening to you that you're going to be sure it was stolen whenever you come out of a ride and the stroller isn't in the exact spot you left it-- which is going to be every time. If you want to worry about something, think about all the alleged reports of housekeeping stealing things out of the rooms. There are FAR more reports of that happening (again, no proof in most cases) than strollers being stolen. Have a great trip.