"Sometimes I feel many people spend time in the user thread thinking Apple will do something. But Apple doesn't monitor this thread, and if the don't monitor it... they don't know there is a problem."
Apple monitor this thread closely enough to promptly delete messages that suggest a legal recourse to this issue (as experienced by those of us who have had our posts deleted within minutes). If they're really a customer-focussed busines, the massive amount of evidence on this thread would have been reported to the tech guys by the trigger-happy forum moderators.
And even without the evidence of moderators closely moderating this thread, there's plenty of evidence (in this thread and many others) of this having been reported to Apple through 'official' tech support routes. The suggestion that the Apple tech people don't know about this problem is simply not credible.
The bottom line here is that Apple are charging for a premium service, but delivering a service below what is offered by free competitors. We can debate these snake-oil workarounds ad-infinitum, but the only real long-term solution is to vote with our feet. I, for one, will be wasting no more time trying to get iTunes Match to work reliably -- I'll give Google Play a try, and if neither of them work, I'll go back to manual non-cloud management of my music library. Either way, I won't be renewing my iTunes Match subscription, unless something changes dramatically between now and the renewal date (in a couple of months).
Apple are a hugely successful business, and they know that if we keep paying them for solutions that simply don't work reliably, they can keep taking our money. The best way to get them to listen is not to waste time on tech support phone calls about problems that they already know about; taking your business elsewhere will get their attention much more effectively.