what will 1000 squats a day do?
The simple answer is less than you hoped for and more than you want. To unpack: 1000 squats a day is far too much. If they are weighted, even moderately, say 225 lbs, I very much doubt you'll be able to do it. Your form will break down at some point and you'll put excessive stress on your knees, hips and lumbar spine.