Widevine is not from Netflix per-se but for all kind of DRM content, including that from other streaming services for all kind of media. Furthermore it is _not

Widevine is not from Netflix per-se but for all kind of DRM content, including that from other streaming services for all kind of media. Furthermore it is _not_ Netflix decision, but a decision legally forced onto them by companies which whole purpose it is to make money from selling copyright which have huge legal influence in both the US and the EU. (Through Netflix does has some influence on the legal framework leading to to, but very limited compared to e.g. Disney.) If Netflix wants to have any 3rd party content, even "old crappy stuff", they need DRM (or way more power/influence). Even for first party content due to round about legal things they might be required to have DRM, I think. (But I am not completely sure).