interestingly enough were one to meet an SO off this app, I imagine they'd become much more likely to stay veg{an} for longer than they might have otherwise, feeling almost obligated to not change that aspect of their personality, it being such a centrally defining factor
I've seen his happen w/ other relationships which started from some shared interest or experience; it becomes a symbol, a fetish of sorts, and becomes tangled up w/ many other aspects of the relationship, making it harder to rethink or change, a kind of calcified self concept.