Some interesting discussion here; let me hopefully clarify things by providing specifics to the situation of these DPEs. I'll summarize below but I've made a follow up reddit thread here if you wish to see more details:
https://www.reddit.com/r/flying/comments/tgtb8c/update_on_portland_me_fsdo_and_terminated_dpes/ I've also included in there a letter I'm sending to various parties and I encourage you to do the same.
In short, I've confirmed for myself that two of the four DPEs I'm aware of having been terminated were terminated improperly and without good cause; and the other two I believe fall under similar circumstances as they were terminated by the same observer.
A Designee Management System (DMS) specialist, while training one of the FAA inspectors, conducted and/or supervised observations three of the DPEs. In each case, the DPE was immediately terminated by the DMS specialist. The on-going checkrides were terminated and the examinee given a letter of discontinuation. All three of the DPEs are very experienced, highly regarded by the pilot community, and the reasons given in the termination letters that have been shared with me are based on subjective observations and do not provide specific details which support the opinion of the DMS specialist. The majority of my first-hand accounts have been regarding John Gary's termination. Both Mr. Tomlinson and Mr. Martel (the other two DPEs) declined to provide statements to me as to their termination and indicated they were evaluating their options moving forward, but my understanding is their terminations were of a similar manner and circumstances.
I highly believe that this DMS specialist is in error based on the accounts of the situation, my personal experience with one of the DPEs, and the fact that I don't see how 3 highly regarded DPEs can all be suddenly grossly incompetent. Much more likely to me is this DMS specialist is incorrect in his evaluations and improper in his recommendations for termination.
The fourth DPE was terminated due to receiving an authorization to conduct Airline Transport Pilot flight tests for the Airplane Single Engine Land rating that was given to him incorrectly by the FSDO and was terminated due to operating under this incorrectly received authorization. While obviously he ideally would have caught the incorrectly awarded authorization the error of awarding it lies with the FSDO. Terminating him is grossly unfair considering the error was not entirely his own.
In the end, in my opinion, these terminations should have been re-training, additional observation, or other non-punitive actions at worst.
As for the comment of "what business is it of mine?", it's my business to ensure myself, my students, and the pilot community have access to reputable and readily available examiners. If we found they were doing something wrong, then so be it. But they were not. These DPEs were highly regarded as fair, knowledgeable, enjoyable, and outstanding examiners. They weren't rubber-stamp DPEs, acting un-ethical (even if you consider having a glass of liquid on a zoom call to be un-ethical), nor were they grossly being improper or incompetent in their examinations. They were simply offering examination services as they should and got fired for doing their job. If this becomes the norm why on earth would anyone want to be a DPE when you can get terminated on a whim with no recourse or rational? I know I wouldn't.
I know I'm going to do what I can to fight or change this. I encourage you to do as well. Soon it could be your favorite DPE getting terminated and your checkride getting postponed. Or it could be you if you became a DPE. AOPA is working with the FAA to reform the DPE system and a reform of this system is clearly needed.