Well, it seems to me it should be quite obvious that the Queen's Gambit, or From's Gambit should not be considered chess variants. So I don't see any reason why this No-Castling Chess (not to be confused with the No-Castling Chess that has existed for many decades on servers like FICS and ICS, which is a shuffle variant) should be considered one. It doesn't bring anything new compared to orthodox Chess, much unlike Capablanca Chess, which is totally different in character, and the indeed more dubious case of Chess960, where at least most initial positions are not reachable from the FIDE position, so that it makes sense to have a separate server for it. But this No-Castle Chess can already be played on any server in the world that features normal Chess, most of them far better than Game Courier.
Well, it seems to me it should be quite obvious that the Queen's Gambit, or From's Gambit should not be considered chess variants. So I don't see any reason why this No-Castling Chess (not to be confused with the No-Castling Chess that has existed for many decades on servers like FICS and ICS, which is a shuffle variant) should be considered one. It doesn't bring anything new compared to orthodox Chess, much unlike Capablanca Chess, which is totally different in character, and the indeed more dubious case of Chess960, where at least most initial positions are not reachable from the FIDE position, so that it makes sense to have a separate server for it. But this No-Castle Chess can already be played on any server in the world that features normal Chess, most of them far better than Game Courier.