As long as everything is done transparently there is no need to worry.These kind of communities are a normal thing it is just that people don't hear about them too often.
Will the tokens sold to those kind of investors be locked and how long will they be locked?
maybe they'll be locked till Product launch!
and I'm guessing this will take some time to develop such a thing (if their development is not already in progress).
But it'll be Great if you post that in their Telegram Group!