Right on. I think it’s rad that you can jump to different setups and not be bothered by it. I’m worried I’m a bit too stuck in my ways, and it’s going to come back to bite me eventually.
There are the two opposites with this, but on the one hand I like to have something weird and new to test out on a semi regular basis, but I will always go back to my current tried and tested shape and buy as many of them as I can (within reason) as long as that shape is still currently being made - BBS 8.38 or 8.5 with 14.5 wb boards.
If it stopped, I do know I have a couple of slightly different shapes as backups so I would not be left without my usual comfortable ride. That said, I don't know exactly how many boards I currently have of the current specific shape I like, but there are a few boxes.
When I rode the black eagle in 8.12 I still had over ten of them new in shrink when I finally thought I should move up to 8.38 or 8.5 permanently, but there are people I know who like them, so I am slowly passing them on as needed.
As to shapes and specific measurements, everything in skateboarding seems to be a lot more fluid, in that anyone and everyone can pretty much copy anything that someone else has and do it themselves, with minimal or no accountability.
As already stated, quite a few riders of one brand / team take a liking to another brand's board shape, so their own brand more often than not will get one of those boards, copy it to be produced by their own woodshop or even use the same woodshop it comes from and do their own board on said shape.
I would think that it would depend on who had the presses and the shape details, but even that has changed from having a solid wood shape to use as a guide, to now having everything completely digital / computer controlled.
Even some shaped boards for certain brands can be left undrilled or the wheelbase changed for another brand, but I think for the specific brands like Welcome or Polar, their shapes are very much their own so PS Stix and now BBS would not have free license to use those shapes for another brand unless there was some agreement between them.
Another woodshop straight up copying a shape from someone else would leave little to no recourse, unless something had been trademarked, or copywrite or patent filed, but I have never heard of this happening. That is not to say that someone has not or would not try to claim something, but I just don't think it is worth the trouble.