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Sites like MQL5.com have developers who can "clone" the logic of an EA just by watching its performance and reading its logs.

This is a grey area. If you own the intellectual property (you wrote the code), it is legal. However, decompiling a commercial EA you purchased to bypass licensing or resell it is a violation of and the EULA of most software providers. Better Alternatives to Decompiling ex4 to mq4 decompiler 40432 updated best

EX4 to MQ4 Decompiler: The Reality of Reversing MT4 Files (Build 1420+) Sites like MQL5

Even if a tool extracts the code, it usually lacks variable names. Instead of TakeProfit , you might see G_var_122 . This makes the code nearly impossible to read or optimize without significant manual reconstruction. it is legal. However