wouldn't bet on it but would certainly be cool to see
I think, in order to make money, they would need two things. One, they have enough information about the players/teams, and enough people or computers to crunch that data so that they can make enough correct predictions so that they maintain their edge vs the bettors. Second, enough people willing to bet on the games to make it worthwhile.
Both are questionable. With NHL/MLB/NBA/NFL, etc you have a fairly good idea who is going to play in the game, and how they will perform. With ECHL the rosters change significantly from day to day, and there are lots of rookies getting lots of ice time. Very tough to predict the outcome of individual games. With the major sports you have millions of people watching on TV or in bars who are placing bets. The only people betting on ECHL games would be those who go to the live games. Thats a pool of ~4000 people per game, and a lot of those are kids or people who don't gamble.
Now if they could use their pre-existing platform and servers, and somehow plug in data from the league without having to invest a bunch of money, and they could make it work with some kind of generic odds, or by charging a transaction fee, maybe it works. But is there enough money in it to make it worthwhile for the provider and the league? Because the league is also going to have to police the players and coaches to make sure no one is betting on the league games.