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Bitibu was established in 2018 as a centralized cryptocurrency exchange. As of now, this platform is not active.
BITKER was established in Singapore as a centralized cryptocurrency exchange. Following to their outage announcement in September 2019, the exchange platform had suspended its activity. The reason behind this was a cyber attack. 
ProBit is the centralized crypto exchange. The accurate location of ProBit Global's headquarters is in Vilnius, Lithuania. It was founded in 2018. The exchange can be accessed via a web browser, via an Android-based or full iOS app. ProBit is a relatively successful platform. It is one of the 100 crypto exchanges with the highest liquidity; however, only several trading pairs have somewhat good liquidity. If you decide to trade on ProBit, you should be prepared for spreads.