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The idea is to replace bitcoin core into bitcoin cash. Then bitcoin cash become legitimate bitcoin

Kind of merger of Bitcoin and BCH. Will it increase the supply of Bitcoin from 21M to many more ?

No.... it's more like you have 1 son (bitcoin core) and 1 step son (bitcoin cash) then you stop supporting your son and give all your support to your step son because you think that your step son is your real son.

Great explanation. Thanks