I dont buy into the whole cast AND weak tone of some posts. It has far less to do with cast or forged, and so much more to do with rhe design of the rim. A badly designed rim is going to be badly designed whether it is cast of forged.
I am not saying that ROTA are badly designed, however certain designs have stress concentrators in the quest of looking good. Not even castings are equal, and really depends on the quality of the manufacture and the design that dictates the strength of the wheels.
General theme is the better wheels never crack because they buckle to the point you cant get them balanced (wheels off race cars)
Someone else posted at it is not a coincidence that the wheels failed where they did, its likely about the thinnest part of the spoke, its at the outer edge so canti-levered by the loads being transmitted from the wheel to the hub....and the design is based on a design that is forged meaning different mechanical properties. So if these wheels are dimensionally similar to TE37s then perhaps they simply dont have the extra material to compensate for the more material flaws/properties arising from casting and not being forged.
So i blame the copying of anothers design rather then ROTA being cheap or nasty. If they are being sold then they obviously meet the required standards, just not up to the loads of racing whish is no criticism.
...and hats off to the poster for posting up the findings. Would have been easy and understandable if you have of kept the failures to yourself. So, thanks for sharing