In general, the more proximal to R&D, the less acceptable it is to vegans.

At these early stages, the research involves animal exploitation and killing to product the initial cells. Some of the production processes do, too. A stalwart vegan might avoid those products as a result.

Eventually, there will probably be companies and production processes that do neither and the connection to harm will be, at least psychologically, more diffuse. More vegans will be cool with it over time until none of them care outside of the issues re: normalizing meat consumption.

There are confounding factors but that's the trend.