In some cases the mono mixes were the ones the Beatles themselves were present for. Some of the stereo mixes were the audio engineers experimenting on their own — this is why Beatles mono mixes are highly sought-after. Can’t recall whether Sgt. Pepper’s was a mono mix originally, but probably an easy search to find out — I’m too lazy to go to my bookshelf and flip through to the Beatles studio notes at the moment…
It was, and there are even some significant differences. On she's leaving home, the mono mix was speed up with the mono version's length coming in at 3:26 and the stereo at 3:35 [0]. I believe (running off of memory here too) that the first album where the stereo mix got some actual attention was the white album.
Are the number of users that use adblock actually increasing? I feel like we are already at a saturation point where anyone who would use an adblocker already does. Adblocking has been around longer than these big sites that use ads as a main revenue source yet they managed to become big in spite of adblocking.
> Will the government move to rule adblocking illegal?
Absolutely not, serving ads is not a protected activity, you can't force someone to consume something they don't want to.
> Will websites engage in sophisticated technical anti-adblock measures?
Already been tried, see anti-adblock and its counterpart, anti-anti-adblock. The solution to adblock is product placement and sponsorship, which has already extremely prevalent.