Not all cast wheels are made the same way. You have low pressure cast which is stronger than gravity cast wheels. Even then wheel strengths varies from company to company. OEM cast wheels tend to be much stronger than aftermarket cast wheels from my experience. This is a reason why they also weigh a ton.
When it comes to wheels you really do get what you pay for up to a certain point.
Mineral White/Mugello 2016 F85 X5M