Context is important.
Arguably the two least attractive markets in the league and he was asked to commit long term with CBJ when core guys left (Panarin) or wanted out (Jones) and asked the same thing in Winnipeg in the exact same situation (Wheeler, Scheifele, Hellebuyck asking to leave).
Warning: this might be more about geography/culture than hockey related. I understand leaving Winnipeg and Edmonton, but Columbus isn't that bad of an organisation. A lot of history of losing? Sure, but players leaving has given it a bad reputation I reckon. Nash stayed there for more than a decade before moving and that is when the organisation was directed by idiots. Jarmo might not be the best bloke either, but he's gotten them to relevant levels where they signed Gaudreau. If there was ever a problem in Columbus, it is that they went after a ton of players that were soon-to-be UFAs which they had no control over. The only players that ever truly asked for a trade were Carter and Dubois. They lost Jones, Duchene, and Panarin due to UFA status which is the day when top markets always win like New York City, Chicago City, LA City, Montreal City, Toronto City, and the state of Florida. Jones went to Chicago, Panarin went to NYC, and Duchene went to Nashville. All had an appeal due to each player's unique character.
With Dubois, he is big-game hunting just like every major UFA player does in the end as well. Denver, Anaheim, Buffalo, Ottawa, St.Paul, Winnipeg, St. Louis, Edmonton, and Calgary would all lose players to big cities, except if they are a contender. Contender status is what makes players want to stay and why the Avs have not been hit by the same wave that Columbus got hit with. With European players, you gotta understand that New York has a ton of Eastern European immigrants and why Russian players gravitate towards that location. New York, Sacramento/lesser degree LA, and Illinois have the largest Slavic populations in the USA. Whenever you see a Russian or somebody similar move around as a UFA, always pay attention to those three locations. I think Swedes and Finns are less likely to care and why they move around less than the Slavs.