Flush need to build a good player base first or a good community to have decent number of participants like what is happening in Stake's forum every week.
Stake has been here for a quite long time and has built a huge community. Flush needs time to build that community and to be honest, it's impossible to build the community with third-party slot games. They need to build their own games at the very first because all the slots are available everywhere in all the casinos. What makes a casino different is the in-house games. In-house games create the community along with some other benefits. I have been playing in a few casinos (though stake is the most) and mostly I'm trying their own games instead of playing other slot games. I enjoy playing Crash. Well, the Flush team said they are building the games but it will take time.