You are right. Also one can invest in IEO of a famous exchange where listing will be confirmed. Having 3rd party involved here will keep your investment safe and the team will not get a chance to scam you.
By making an IEO purchase on a well-known exchange, it is clear that it is very good for us to follow because we can get tokens at low prices and are not at risk for fraud and I suggest it is better to follow the IEO on Binance or Kucoin there usually hold an IEO along with staking on the token when selling finished.