The 31 other NHL teams decided to not pick up Cam, leading him to clear waivers and be a little burden on the Flyers cap space at a $2,358,333 penalty this year and a $1,78,333 penalty next year, according to CapFriendly.
He was originally going to have a $5+ million cap hit in his final year of the contract, so this helped the Flyers greatly, saving $3 million this season. The Flyers could be gearing up to make some type of trade or signing during the off-season.
This, of course, gives any team the right to sign Atkinson if they wish during free agency. Maybe the Rangers make a run at him for less money.