I understand with Icopress, even if it is not a rule, it should be ethical to recommend what you promote when the need arises. But then, there are some exceptions such as; a situation where the signature participant doesn't actually know that wazabbi is an open source wallet. It is very possible and if that is the case, I wouldn't blame the signature campaign participate.
You do not even have to be in the Wasabi campaign to know that it is open source, if you are in this Bitcoin forum, you ought to be aware of that information and more so when you are then a member of the said campaign. As a campaign participant, the bare minimum should be understanding the basics of what you are promoting.