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I think that the wording isn't as elegant as it should be.
Perhaps it would be better to write something like "please consider developing these plugin is a lot of work, so if you provide your own builds online, you might reduce our much-needed funding we get by selling builds ourselves"
... or something like that.
After all, if it's GPL, they can't keep people from doing so. Same way distros can bundle Ardour binaries.