When you create a repository on GitHub the default branch is main. It's not prohibited to use master as a default branch, but that would require a bit of a setup on GitHub to change the default name. Now I personally don't have a preference on how the branch is going to be called, but if a service, that I rely on a daily basis, asks me to do a one tiny naming change I prefer to comply out of respect.
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When you create a repository on GitHub the default branch is main. It's not prohibited to use master as a default branch, but that would require a bit of a setup on GitHub to change the default name. Now I personally don't have a preference on how the branch is going to be called, but if a service, that I rely on a daily basis, asks me to do a one tiny naming change I prefer to comply out of respect.