Thank you so much guys for your answers, I'll take everything that you've said to the account. I've checked all the things that you've mentioned and it looks credible to me. I looked them up on this website
https://www.tokendesk.io/ico/bitcoinus/ Also, I have read their whitepaper, and I really like it as well. Do you guys know any other tools I could use to check them?
It is not enough to examine only the white paper, the trust factor according to this forum from the manager / dev who offers ICO should also be considered and see also the percentage of ICO success brought if he is often the manager