Aldi, Penny, Rewe, Konsum and Co have recognized that vegan foods are more and more wanted and needed. There are many products there, such as soy milk, tofu or even some foods from veganz or taifun.
Lidl does not offer such products in my opinion. Lidl is the only supermarket (at least where I come from), especially in train stations. If you need soy milk o.ä. on a Sunday, you're screwed.
When does LIDL realize that the vegan diet is now widespread and current?