This number has obviousy been growing in through the years. Its one of the few parametars on Hive that keeps growing even during the bear. Obviously trading itself can be a lucrative activity and this is showing even in the Hive DEX.
With the stabilization of HBD in the last years, its now become usable for trading as well. Aditionaly the stabilizer is providing some liqudity as well. In terms of volume the Hive DEX is now doing between 50k to 100k per day on regular basis. Things can get very intersting on the DEX if the Hive price increses. The volumes can be in the millions per day.
Its also interesting hypotesisis that these activity need RCs. And if there is competition and users want to out run each other, they will need RCs and Hive, similar as users are spending gas on Ethereum to frontrun trades.