«ATM it's pretty slow» For most cases you don't have to wait for a confirmation. Accepting a typical non-RBF 0-conf transaction is safer than accepting a credi

«ATM it's pretty slow» For most cases you don't have to wait for a confirmation. Accepting a typical non-RBF 0-conf transaction is safer than accepting a credit card payment, because it is trivial to reverse a CC charge, but difficult to suppress a 0-conf transaction sitting in the mempool of thousands of Bitcoin nodes. «many coins have one pool with majority» It is not the case for most popular coins: BTC, ETH, BCH, LTC...