The thing about Bao Qian undercutting competitors is just par for the course. It's also not particularly damaging for two reasons:
1- Bao Qian will not be here indefinitely, is not setting up a permanent business that may send representatives to do the work later, and he can't possibly take all of the jobs for these ruined-recovering areas of Emerald Seas. Barons in need of finance will still have jobs, and will soon be getting a rather large increase in work what with the war.
2- networked connections of a Bao scion to a Liege who spends their finances to hire problem solvers for a practically endless process of reclamation and building . . . honestly so long as the liege continues to pay for work to be done any prosperity for the liege can be expected to benefit the hired barons as well. Trickle Down economics doesn't work because you can easily cut individuals out of the system. However, if the Barons continue to be hired into the system (as opposed to an endless stream of "Bao Qian's" taking all available jobs in a circuit which cuts them out in perpetuity) then it'll be net benefit in the long term for them. IF Bao Qian utilizes these connections for wealth flow at some point (likely).
What I'm saying is that Bao Qian's behavior would only be an issue if:
there were a lot of students doing similar things in the same region Bao Qian is doing it
the Baronies are teetering on disaster and are completely reliant on taking these specific jobs for these few years
it's expected that jobs like these will likely run out in the near future
I find it unlikely that Bao Qian would network with a region that is that close to collapse. Unless perhaps he's trying to poach some talents from the collapse? I could see a Bao doing that at some point in history. Perhaps it's even a contemporary practice. I think that practice would be rather frowned upon by Cai Shenhua though, so if it's common they've been keeping it a secret from her. Or it's a practice done on holdings that seem to be severely underperforming or otherwise are not accomplishing the goal of recovery/reclamation? I could see Cai Shenhua accepting the cannibalizing of stagnant regions in the name of progress.