i agree with you, because they have their own trading platforms so I do not think it's necessary to list their tokens on other exchanges. The need for more advertising in the promotion of their website. The project team has to work more so that it can achieve huge trading volume and easily reach out to everyone. Hopefully the project will be a success with the investor and the participants will be able to participate
First of all, I don't think the team are capable to build a regulated working platform in term of business since I didn't see any real activity for team numbers, like video or attending event for such a big project that deal with fiat and real asset.
Back to you point about exchange and assuming this is a real project. They are not going to build cryptocurrency exchange like binance ,bittrex etc. The ALLSTOCKS Network is a global stock exchange platform which aims to interface with all major stock exchanges and stock brokers around the world and this is mean that they need to develop to strike a partnership agreement with existing exchanges and brokerages. Now imagine how much will take to make those agreements in order for platform to start working. Do you want investor to wait all that time to trade his token.
Plus Tokens that will be issued on platform by other people can be tradeable on any exchange, So ATS should be listed on other exchange too.