If you "studied" for 3 month and still do not know this then what were you doing for 3 months? Seriously you did not study at all! No they are not hardforks. They do create their own chains from scratch and they do not fork the dash chain into something else. They are also not all based on DASH, in fact lofts of the lesser knows MN coins are based on shitty coins that where just easy to fork (software fork only). Some of the MN coins are based on PIVX and other coins but I guess most of them are based on DASH.

I actually fing hate this "initial commit" github repos that just dump code out of nowhere without showing where its comes from. Lots of coin creators just pay some devs to fork a coin for them to try their get rich fast scams. POLIS is one of the few coins where you can actually see " forked from dashpay/dash" on Github. The way it it should be done but so many coins actually do not do that and just dump code on there without any history. I hate it.

If you would actually look at the Github of this coin you would see "BirakeCoin (fork of PIVX)" that takes you 3 seconds and you failed at this after studying nothing by MN coins for 3 months and think its a DASH hardfork? seriously.