Personalised pricing is evil indeed. You make an interesting point because exposing that evil likely gives an angle on why carriers resist open data which I had not considered.
When I raised the question, I did not mean to limit the request to official sources. In fact, I somewhat expect that a dataset would come from an independent 3rd party. Even if the prices are biased for a particular person, it’s relative pricing that’s most interesting anyway.
Finding the cheapest is quite useful even if there are slight markups/markdowns with whatever vendor sells the ticket. Flixbus discriminates against Americans by adding $1 to every ticket from US IP addresses, but a US dataset would still help me decide outside of the US which route is the cheapest.
Note as well that routes and schedules are useful even without accurate pricing – for BlaBlaCar in particular because people offering seats in their car have no periodic schedule.
I had the same idea but AFAIK it does not exist.