It’s definitely not a restrictive eating thing for everyone but it is used by many to cover up worrying eating habits and restrict food.
I’ve never seen someone able to be completely vegan - ever! And I’m studying med atm with a special interest in nutrition so I’ve looked into this extensively. There’s always some fruit and veggies that’s pollinated by bees, fertilised using animal produce etc etc. All throughout my youth, I worked in restaurants and never once saw a vegan fryer - a veggie one, yes, but never a vegan one even in huge kitchen so the ‘vegan’ food is always being cooked with non-vegan foods. Kitchens are also required to have dairy free and vegetarian utensils, but vegan utensils are not a legal requirement so you could have something, for example, that is vegetarian and contains eggs being prepared on the dairy free chopping board which would also be used to prepare vegan options. There’s always going to be some form of input from animals and a degree of cross contamination. I think most of the vegan societies have now recognised this and promote cutting back on using animal products where you can but acknowledge it isn’t fully possible.
Edited to add - this is in the UK so laws regarding vegan utensils and other equipment might vary in different countries.