you are smart and you know that it is better to not discuss openly about the logic behind dump.
We did the same mistake on another place and now the toy is broken. It is good to share but at the same time you must avoid exposure (I'm talking in general).


Anyway your post is very good but it is difficult to prove it.
For example you wrote that EOE is important to apply 1x or 3x but it isn't completely true.

I have examples where I can easily apply 1x or 3x with eoe not permitted but it isn't an OTA mistake. In other words eoe permitted is important but it isn't mandatory.

I'm not so old in this game as other experts but I saw only one dump in two years which I can't exaplain. It was an 1x dump for an ST carrier (eoe not permitted). A lot of OTAs allowed this dump but I didn't manage to understand the logic behind.
So "MAYBE" you are right that "SOMETIMES" it is a completely OTA mistake but as I wrote it was just 1 example in 2 years!

Other times you can find a dump but the OTA will not issue the ticket.
For example there was VN dump. It worked on some OTAs but at the end it was unbookable because of fare rules (obviously it is my theory but at least I can prove it with fare rules).