Chinese platform FCoin announced in February, 2020 that the exchange will stop its operation. A founder of the exchange explained this decision by internal errors.  FCoin still owes its users the amount from 7.000 to 13.000 BTC. 

Coinrate is currently inactive. The exchange’s website does not display any active orders in the trading window. The social media channels of the company had not been updated for about 2 years. Initially, Coinrate offered fiat currencies as well as Bitcoin and Fargocoin as the main currencies in trading pairs.

Update: It seems like the CoinMex exchange shut down, possibly exit scammed.
CoinMex provides access to BTC, ETH, USDT and NEO markets. The company was incorporated under the legislation of the Republic of Seychelles in 2018 and is affiliated with NEWEX Technology Co. Ltd. CoinMex is focused on the Chinese market. 

It became known in spring 2019 that Gatecoin exchange would stop its operation. It was stipulated by the decision of the Hong Kong court after quite a long attempt to recover lost funds. The loss amounted to $2 mln.

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BX Thailand is currently not providing exchange trading services. The exchange is officially closed. 
Bitcoin Co. Ltd. was the operating company for Bitcoin Exchange Thailand. This company started to seek licensing from the Bank of Thailand in 2013. After receiving approval from BoT, the development of the exchange service under the brand BX.in.th had been started. Following that, the merchant service CoinPay was launched.

Tux Exchange is currently not operating. It was closed in 2019 with a prior announcement as of June 15, 2019. July 6, 2019, was the deadline for the withdrawal of funds. Tux Exchange referred to “unfavorable conditions” and “low volume” as key factors stipulating the decision to close down.