Actually, the first (IIRC) lab-grown burger was served 4 years ago in Maastricht, The Netherlands, by a company called Mosa Meat, back then already backed by Gates. A quick google finds https://www.vanityfair.com/news/2017/08/bill-gates-and-richa... on that investment, but I'm sure there's more. I think they got the price down a few hundreds per burger by now, still a way to go obviously, but there are many in-vitro research groups in Europe.