The following is a wildly optimistic speculation here since we're talking about government bureaucrats here, but perhaps they noticed that in the Windows/IE cas

The following is a wildly optimistic speculation here since we're talking about government bureaucrats here, but perhaps they noticed that in the Windows/IE case: - The choice screen thing didn't make one lick of difference, and: - MSIE died of completely self-inflicted wounds anyway only a few years after this. Perhaps these two facts, though they don't prove the 'choice screen' was bad, also did nothing to establish that approach as a proven way to promote competition, so regulators weren't moved to emulate it. (Personally, I would argue that choice screens at a point in time when one option has overwhelming mindshare are pretty pointless. Everyone will choose the dominant one by recognition, except geeks who knew how to change defaults anyway, and confused newbies who are probably the ones who realistically should be using the most 'mainstream' option anyway.)