I do not endorse and don’t think it would be helpful to not join while training or to immediately quiet after CPC. What until you get screwed over and then quit, it probably won’t take long.
On a related note, 2022 will have the last big batch of COVID trainees who had their training delayed in some cases over a year and were “screwed”. So I think NATCA will have one more year of major defections next January as a decent amount of those people will jump ship.
Plus several dozen others who got jobbed by NCEPT for yet another year or people who get tired of people like Mick. And the people who will reject the major push by NATCA to campaign for left wing candidates this Fall.