All rims can crack and buckle.
All rims do have a used by date, especialy in motorsports.
The type of material alloy used determines the rims strenght.
Froget casting are generally stronger than any form of casting.
Gravity, low pressure and spun rim casting all have their pro's and con's.
So why do rota's have such a bad rep? first there was a company that stopped selling these rims due to a death of one of their customers, then its that they are new and fail, and how they break, seeing that there arent any air bubbles the only conclusion I can come up with is the type of alloy used, if they are using used metal which is very common in china, you have a huge range of alloys melted so it would be impossible to determine the rims strengh, if the thing could that they are using cheaper grade alloy.