Netflix has already partly blocked Widevine from Chrome OS with L3 DRM. Using NF addon you get only “Software decoding” and none of devices using L3 DRM are certified by Netflix. You can see that only some NF streams are reproduced in HD-1080p, and most are only in SD resolutions. Read the Reference table of high resolutions on developers site
Netflix is constantly working on blocking all not authorized users, so everything can be expected