Why is Core the only implementation of Bitcoin?

I'm curious from an educational perspective:

  1. Why no other implementation of the Bitcoin protocol has been created since the BCH split?

  2. Is it possible to spin up a Bitcoin XT node (for example) considering that the BTC network is "compatible" all the way back to the first Core implementation? Would it immediately split from the main chain?

submitted by /u/OkStep5032 to r/btc
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Quelle: bitcoin-en