What point are you making? Yes, many of us remember. The cable companies know all too well too. Cable Internet in part drove the changes as did high turnover in residential occupancy. Having unscrambled channels coming over the same line meant that Internet customers were getting some television for free. The cable providers went to a box versus putting blockers on the line. A box that was in your home versus dispatching a warm body to install something that could be easily disconnected if it was on the side of the house.
The box for basic cable isn't even truly a box it's about the size of a pack of cigarettes. At least that's how Comcast does it.
I cannot really blame the cable industry from moving away from Clear-QAM support. That was an old mandate that they had to provide public access channels in Clear-QAM on their lines to anyone that had an activated cable drop (which included internet with no cable package). But it honestly made no sense. It was nice while it lasted, certainly, but all those channels are provided through ATSC OTA tuners, so they took nothing away from people who were essentially taking advantage of the cable mandate. That was an old mandate that essentially stemmed from the era when cable was essentially a means of delivering OTA to people without antennas, and more reliably. But cable has evolved way, way beyond that.
But I think part of the move away from those wide-open channels also involved the move to pure digital, killing off analog to free up a ton of bandwidth on the cable lines. I'm fairly sure most of the cable industry, when meeting that mandate, was doing so with full-analog broadcasts. It may have been digital and HD on some channels, easily evident when there were subchannels present (11-2 as an example), but plenty of channels that were also provided, at least here, were still single-channel analog.
I thought more was involved but after a little research, it was still the same to the TV. But it seems that at least some cable providers used the opportunity to get rid of Clear QAM support while, at the same time, removing all the old analog channels to provide more carrier channels to utilize for digital video or data.
Here, they didn't roll out the digital adapters for TVs until that area moved to entirely digital, they didn't just blanket encrypt all the public channels in one fell swoop.
(this has provided me an excuse to further read into the actual underlying cable signals and technology. I like it.

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