The cause is stupid design to accommodate STUPID eyelets. A square section rim?? LOL
BF needs a comedy forum for these asploding rim threads.
My oldest Velocity Dyad 700c has 32,000 miles including 8,100 with the SA dyno drum brake on the 120 lb tour bike.
Looks as good as new. The nipples settle into the thicker rim alu, that's what makes it solid.