The difference is that on Android you can get a different store, and the only thing you have to do is turn on dev mode and then download/run the apk. There see

The difference is that on Android you can get a different store, and the only thing you have to do is turn on dev mode and then download/run the apk. There seems to be a lot more friction to sideloading a Chrome extension: download, unzip, turn on dev mode, click a button & navigate to the unzipped files...