This tannic “oak” taste is very often made from small pieces of wood added to the wine. This has been allowed in France for more than 15 years for several wines, is common across EU, and is the norm outside Europe.
This probably ties in with the topic above. If your wine ends up with the exact same composition as more expensive wines but is made with fewer resources and the only way you can differentiate it is with knowledge of the label then perhaps the wine industry has missed the point.