Guys there's absolutely no technical reason for duplicating your coins and developers are profiting much from these ardr and ignis "snapshots"... they know in advance when they'll do them and buy/sell in advance nxt.
These concepts of "child chain" and "parent chain" they are selling do not exist for other cryptos, where they usually just fix the production code of a coin.
Don't fall for the rug peddler's trap.
They do not exist because, like Nxt before it, Ardor is leading other cryptos, innovating on the edge. Other cryptos will pick up these innovations a couple of years later as it happened with Nxt.
As for developers profiting, do you expect them to work for free? Who will pay the R&D and marketing? Are you twelve? This is how the world runs.