I've seen few projects that decieved investors into thinking that they will list on binance or okex and Kucoin without these exchanges confirmation, my advice is once a project claim they are going top exchange do not hesitate to go to the top exchange social media, if the listing is legit the exchange will atleast say something about it. Wise up
But not every admin knows about that. Dogdata project is a typical example. I had to join Bitforex's Telegram to ask about Dogdata's IEO but the admins there said they never knew anything about it. but after just a week, they uploaded Dogdata's IEO information 
In general we should find out about that project. Factors like partners and new investors are something to consider. Listing on big exchanges is only a matter of time if it's a good project. Typical example is Cartesi.