Five hundred hours of life for a model airplane controller, particularly a low end one, is effectively infinite. It is something over 2000 typical flights, probably more like 5000. Even top fliers seldom if ever go that many flights without a rapid deconstruction event or two. And that number of flights assumes the temperature is at 105C over the entire flight. A more typical profile would have the cap at some temperature near ambient (though perhaps solar heated to temps up to 40-60C), rising over the flight time to a temperature that might approach 105C. For a flier with a huge investment in batteries you might see a subsequent flight before temps had returned to ambient, but there will still be some relief, extending the predicted life. All of which suggests why I haven't seen a field failure of these capacitors. Not saying it doesn't happen, but it is rare or non-existent at the flying fields I have frequented.
These controllers are pushed hard for light weight and high power. My experience is that FET failure is far more frequent than failure of the electrolytic capacitors. I have had that failure personally on a few controllers.