Of course there is. Not saying no vegans eat it ever. It could be a regional variable, but I’m speaking about population as a whole, not your local vegan restaurant. Google says 86% of plant based meat is bought by meat eaters. I also work in the field so have some knowledge on the subject. 86% is about right but could be 5-8% high. But in any case, the people who buy it are broadly meat eater, or more likely “flexitarians” .
And vegans should eat more plant based meats. The better brands are very healthy and it could help them stick to their vegan diets.