Someone should tell all the countless riding groups out there that they're breaking the laws.
I think you're jumping to a lot of conclusions. Group rides are perfectly legal so long as everyone is riding by the rules of the road. 10 bikes in line is, so far as the HTA is concerned, no different than 10 cars in a line - each bike is a separate vehicle in the eyes of the HTA, which is of course, why the law DOES stipulate they can't share the same spot in a lane - IE, no bikes side by side, but proper staggered (or even single file) formation is fine.
Blocking of vehicles? Again, so long as the bikes are doing at least the speed limit there's no argument to be had there - 10 bikes riding along a highway doing the speed limit cannot be imposed upon to speed up or pull over to get out of the way of an impatient car, much less can somehow magically charged for impeding traffic while simply riding along. By that logic, my truck at work which is computer limited to 100KPH could be charged with "impeding traffic" if I was driving along on a single land 100KPH road, unable to go any faster? Yeah, not going to happen. Yes, if the group is riding *exactly* at the speed limit and there's some incredibly impatient (ie, dangerous) cagers behind, a courteous group will pull off somewhere and let them pass, but again, there's no HTA issue there.
And out accelerating another vehicle? Again, each motorcycle is treated by the HTA as a separate vehicle, so accelerating to catch up to the bike in front isn't a problem unless the person accelerating is exceeding the speed limit or rides up beside (instead of behind) the bike ahead.
Anyhow, group rides have been going on for decades and I've been part of lots of them. Nobody gets hassled unless they're doing some flagrantly wrong to attract attention to themselves. Traffic blocking at intersections for example is something that can attract unwanted attention, including making other motorists angry, but it comes down to how the group manages themselves. I went on a couple group rides in the 90's that ended up being train wrecks and I bailed out inside 30 minutes for fear of my life, but the group I ride with now is a whole different (and much more enjoyable/safer) situation.