Now that BM is public, I assume we can relatively easily get answers to information about quantities sold. I would be interested in seeing a Fermi estimate of suffering-days they have averted or something similar. (A simple model is something like: quantity sold times fraction of customers that would have purchased the corresponding animal product times days of suffering per animal product.)
I would think any direct impact would be quite small, as the products are all aimed at substituting for cow products now, and cows are basically a rounding error in the number of farmed animals. It seems like the main impact of Beyond Meat is to drive the plant-based industry further and to establish itself to be able to produce higher-impact replacements down the line.
I think it's bad for Beyond Meat's brand to sell low quality products though as they've done in the past.