Well, they still start from real animal cells, from what I understand.
As a vegan, I'd have that dilemma. If I was an utilitarian, I'd probably justify it more clearly.
In the meanwhile, I'm quite happy with vegetable based "meat". It was definitely harder to be vegan 10 years ago (social interaction somehow demands a certain diet), and especially here in Spain. Now it's really easy and confinement makes it easier too.