Veganism has definitely become fashionable. And there are, no doubt many people badging themselves as vegan who are solely motivated wanting to be part of a cool movement. The immediate question this raises is ‘So what?’ Humans do many things every day because they believe others will perceive them in better light because they appear to be part of the in-crowd.
I think a far more interesting question is why do people (more specifically people descendant from the Abrahamic religions) feel the need to judge other people, or even feel they have the right to pass opinions on the actions of others? The desire to tell others what they are doing wrong seems to be a rite of passage from these people!
Humans love fashion. More accurately, humans are social animals that enjoy identifying with groups in a society. We all have our own self-images and we all strive to act consistently with other people we feel are getting the acceptance and admiration from society that we all crave. Even when our self-image is that of non-conformist, we actively seek out fashion icons we can associate with to ensure others see us as the person we want to be.
When people adopt a vegan lifestyle as a fashion statement several things happen. More animals are spared from being killed and eaten. More cows are spared from the tortures the dairy industry had in store for them. The environment benefits from the decrease in meat and dairy production / consumption. And the fashionable vegan becomes more healthy. Their skin becomes clearer. Their weight moves to a move healthy place. All these things are positive and good.
Another thing that happens is that a lot of people who would never have heard about the vegan lifestyle, were it not so fashionable, have come into contact with it. This results in them learning the benefits of the vegan lifestyle to themselves, to the animals they share the planet with, and to the environment. This is turn will result in their motivations to remain vegan maturing. This is all good. Veganism becoming fashionable is providing many benefits to everyone. It even provides the judgmental souls on the planet with another thing to criticize people for.
Regardless of why you have been motivated to go vegan, just enjoy all the benefits the vegan lifestyle bestows on you.