Law-abiding companies like Microsoft won't knowingly violate a license.

My understanding is that Microsoft makes an effort to exclude all GPL software from its training. (Is this true?)

What we need is a more permissive MIT- or BSD-style license that defeats Copilot.

We just need to convince law-abiding companies that they must not use the code.

Where did Microsoft say that GPL code was excluded from the training dataset? Since not including attribution is already a violation of MIT/BSD-style licenses, I don't think MS is discouraged by violating licenses.

Unfortunately, I cannot find support for my claim that Microsoft excludes GPL-licensed code.