RDD...

RDD more or less actively traded on two exchanges, with the rest of it have long been removed. Is there any chance of any further development of the RDD, if he has ceased to trust so many exchanges?

The irony is that Reddcoin development has never been so active with a core group building up to the release of Redd-ID, preparing a global decentralized deployment of Electrum servers, promotional games ongoing, etc. One of the main reasons some exchanges have delisted Reddcoin is due to its low value (recently down to a 2-3 satoshi spread). This in turn is due to its high issuance providing a large divisor to market cap. But from the point of view of the utility value of Reddcoin as the basis of a social micro tipping platform, these points are precisely the strengths of Reddcoin. This optimism is reflected in a strong network with a consistently high and increasing number of nodes (https://bitinfocharts.com/reddcoin/nodes/) and consistently rising network difficulty.