WSL2 basically is a VM running Linux :) There's actually Windows-native docker which runs Windows containers. But it's not very useful, because there are very few images compiled for Windows.
Docker is useful because of those thousands of companies publishing "official" images. You can't expect them to publish those images for every possible platform. They target Linux x64. May be they'll target Linux ARM, may be not.
Docker is useful because of those thousands of companies publishing "official" images. You can't expect them to publish those images for every possible platform. They target Linux x64. May be they'll target Linux ARM, may be not.