One option is to use the market, make it free.
UCCtrader:
Hi Everyone,
I have an EA I want to make available to the public for feedback but I want to keep it's source code hidden.
Can someone advise me on how to do this?
Thanks in advance!
Share the ex4 file.

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Hi Everyone,
I have an EA I want to make available to the public for feedback but I want to keep it's source code hidden.
Can someone advise me on how to do this?
Thanks in advance!