I'm not sure if we're agreeing or not to be honest. I'm not sure if you're implying it's a bad thing that people won't contribute to AGPL+CLA (and thereby justifies these more restrictive licenses), or agreeing that people shouldn't contribute to AGPL+CLA (and thereby volunteer their time to the benefit of one specific vendor).
Whether or not someone contributes to something and under what terms is a personal choice. I dont think there is anything wrong with not contributing for any reason at all. Or if you dont like the cla, forking it and not using a cla in your fork.
I view that as a very different question from whether its ethical to advertize something agpl+cla as being open source.