Without any help, this would almost assuredly be true.
In general isn't the point that you can't help software vendors port to one architecture without helping them with the other. After all, the OSs and compilers are the same ones. Unless you are suggesting help in exchange for promises not to port to the competitor architecture, which I don't think the software companies would be likely to fall for/accept.
Are you saying that you know such agreements are in the offing?
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