Disable wallet fallbackfee by default on mainnet

src/chainparams.cpp

@@ -175,6 +175,9 @@ public:
                         //   (the tx=... number in the SetBestChain debug.log lines)
             3.5         // * estimated number of transactions per second after that timestamp
         };
+
+        /* disable fallback fee on mainnet */
+        m_fallback_fee_enabled = false;
     }
 };
 
@@ -266,6 +269,8 @@ public:
             0.09
         };
 
+        /* enable fallback fee on testnet */
+        m_fallback_fee_enabled = true;
     }
 };
 
@@ -343,6 +348,9 @@ public:
         base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};
 
         bech32_hrp = "bcrt";
+
+        /* enable fallback fee on regtest */
+        m_fallback_fee_enabled = true;
     }
 };