Bibox exchange is same country with Kucoin that based on Singapore. They are not that huge but they have a decent volume on their exchange. I use them for quite some time for buying exotic tokens that is not listed yet on huge exchange. OP doesn’t have any proof so I will not judge the exchange quickly.
What I saw is that there are many users who have not been able to withdraw from the Bibox platform yet, and OP is not the only victim here, in addition to that there are those who claim that after they downloaded the Bibox application on their phones, it was classified by AntiVirus programs as a virus.
Although the OP did not provide conclusive proof, what I saw from google search engine proof made me endorse the OP's position that it is a scam exchange platform.