"At first, a vegan diet seems to make complete sense for many people from the animal welfare point of view. This is in fact being challenged by more and more people who are coming to understand the devastation caused by monocrop agricultural practices. Animals are exploited for milk production as much as they are for meat production, maybe even more so."
Yes, animals _are_ exploited for dairy at least as much as they are for meat which is why vegans do not consume dairy.
"Yes, a keto vegan diet is possible [...] Preferably, and this is key, it should include eggs, dairy and bivalve crustaceans"
Then it's not a vegan diet! I can't trust nutritional (content marketing) advice from someone who can't even keep themselves clear on what diet they're talking about.
Really twisting the overwhelmingly common definition of a vegan diet.
Either way, people are taking it seriously because clearly a low carb diet will deliver weight loss results. whether or not it's healthier in the long run remains to be seen.