Yeah, I've worked in the industry for a long time. I think good regulation would prevent per punter limits. I don't really see why doing this would make the industry unprofitable, the odds have a margin baked in, exactly the same as a 0 (and in the US the 00) in roulette. Worst case they would have to increase the margin, which maybe isn't so good for casual players but at least it's a level playing field.

I also find the common implementation of in-play delay poor. The way it generally works is a delay is applied before confirming the bet, anything which changes (including pricing) causes the bet to be rejected. The main reason for this is that the traders sometimes only have access to something like sky sports so their feed is quite far behind someone at the stadium. I feel like in reality it should be based on official timings.