I understand your concern. Getting on exchanges is on the backlog for the team. Right now they are fine tuning the user experience and developing a lot behind the scenes like the Proof of Growth rewards. They made some HUGE changes to the algorithm recently that benefited the community in a big way.

Check out the blog post: https://www.merit.me/blog/week-of-pog2/

They are working on ways to integrate exchange wallets and users wallets and I dont see any technical issues why merit couldnt be listed on the exchanges you listed. The invite aspect of this would get figured out- Just requires a bit of integration