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.
There’s actually a lot of plant based meat that are chemical / preservative free, Redefine Meat comes first to mind. As there is a lot of animal meat that is full of chemicals, preservatives, carcinogens, and antibiotics use.
I would only assume most fast food meals, meat ones included, are not chemical / preservative free. That’s a western fast food problem, vegan or not.
Lastly, vegan people broadly don’t eat plant based meats. Like it get the joke… It’s just broadly inaccurate. Meat eaters, people trying to eat less meat, and some vegetarians buy plant based meats.