NHL teams are in training camp, and the preseason has started. The season will start in earnest in just a couple of weeks, and between now and then, general managers and coaches may decide that they do not like the look of their rosters.
They may try to add free agents or make trades. Sometimes, this will go on behind the scenes. However, when it involves a player like Winnipeg Jets defenseman Jacob Trouba, who is refusing to report to his team because he does not have a contract and has asked for a trade, it's out there for the public to see.