you don't need pig enzymes to clear beer, you can do it with gelatin. though that's also def not vegan, haha
I think it depends a lot on why you're vegan though - alotta people it isnt about the animals themselves but a recognition that animal products are an inefficient use of resources. In that case utilizing animal byproducts doesnt contribute to the waste of resources - however eating heavily processed animal alternatives (fake meat & cheese) often does.
Still, some people make the choices and dig deep into the research to make the MOST possible difference, whether against animal cruelty or against waste etc, but if someone's going to make a choice like veganism, they don't necessarily need to take that to the extremes of concerning whether there might be oxblood at trace levels in your ketchup to make a measurable impact with a modest effort