They don't understand that we never agreed to any of their TOS/policies, they don't understand that we don't use their API. What now? Things will continue normally until they can't anymore. Assume ...
It seems to me that this article just describes the same situation as the github issue. I think they just used the term cease and desist. So no further escalation from what I can tell.
Things escalated, folks. They got a C&D:
https://torrentfreak.com/youtube-orders-invidious-privacy-software-to-shut-down-in-7-days-230609/
Start backing up the source repos now.
It seems to me that this article just describes the same situation as the github issue. I think they just used the term cease and desist. So no further escalation from what I can tell.