Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
This seems to be your opinion as it is not my experience. My beta expired with iOS 6 and it was incredibly easy to get to a computer and simply downgrade back to iOS 5. It was not hard. The hardest part was that the beta expired while I wasn't home and had to wait to get home before I had my phone again. I survived. ;)

I was mainly referring to people who downloaded a file off the interwebs somewhere and installed it, without having a registered UDID.

Granted, something like that happening is slim, but it has happened to a few people here trying to downgrade after installing iOS 7. Whether it was due to user error or some unknown bug, I don't know. Either way, rumors like what the OP is asking about are not something I am worried about. For all we know, the rumor was started on Twitter or some other social network, as a means for scammers to get more money selling UDID's.
 
I re-installed iOS 7 and its fine now, but decided to register my UDID this time around. Not sure how to prove im not a "scammer", but woke up and my phone was on the activation screen.. when I tried to get past it, it told me my device wasn't part of the program (obviously). I then had to restore back iOS 6. I hope for the sake of everyone else, it was just a random bug that caused this and not Apple blocking users. either way, very weird.
 
Did this really not happen to anyone else? I'm being 100% serious, woke up and my phone was in the activation screen. had to restore back to ios 6.

This happened to my mom and I, both iPhone 5 on iOS 6, so I don't think this has anything to do with iOS 7 beta.

I downgraded back to iOS 6 2 days ago and my mom just got the iPhone 5 less than a week ago, she was never on iOS 7 and around 1am both our phones went into DFU mode randomly.
 
If you use iOS 7 Beta 1, there were some rumors that iOS 7 Beta 1 users will have their phone bricked in Recovery Mode in June 24 at 12:00 (Greenwich Mean Time).

Was this rumor real?

I dunno about the date, but every phone on every iOS beta has a brick date. All the betas are time limited.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.