Centra Tech, a widely advertised ICO had it's co-founder arrested after they were trying to escape the country with collected funds.

They were successful in raising 32 millions by claiming to offer a variety of financial products, including a debit card backed by Visa and MasterCard, with which users could instantly convert cryptocurrencies into US dollars and other legal tender.

Floyd Mayweather had previously endorsed the ICO, probably a paid job.