So, yes, there are sneakers made by gum and canvas (like Converse) but these are not the best pick for everything.
I’m skeptical on leather alternatives for shoes, “fake leather” has generally low durability and I’m not strictly interested in cloning the aesthetic; when it comes to boots/shoes there are very poor alternative to a refurbished leather pair: great durability and flexibility, traditional models can be resoled, great looking over time when well maintained, the ecologic aspect, etc. Also the price: new tech-fibers are generally very expensive with dubitabile quality, while leather can be very cheap considering what you pay for.
What do you think about it? What’s your daily use? I could edit this OP to share products you found interesting.
(edit) An user suggests vegetarian-shoes.co.uk
I actually like the idea of improved canvas but I don’t like sneakers, apart from aesthetic taste they are mostly glued to the sole for industrial reasons, overpriced. I’m completely pro to not try to mimic leather, I also find it particular counterproductive for different reasons.