I think something similar, it is likely that the current platforms that are offering poker rooms and tournaments are not really that profitable at all but they are doing it because they are planning on getting most of the market share once it flourishes, this is a very common tactic when it comes to businesses, businesses are willing to keep a part of their operations open even if it is not profitable right now because they expect it will be profitable in the future.
Most likely that's the main purpose, they are willing to spend some money to host such events,
In hope that in the longer run participants will use their platforms and they will benefits out from it, this kind of business tactics is very common way to attract participants to use the service and along the way once they already familiarize they will use it and bring more
players to play along with them.