So regulate the uses of the technology. Don't ban it outright.
Those companies are doing their manipulation currently by using the Internet and social media, should the Internet and social media be banned outright? We're using social media to discuss this right now, that discussion should be suppressed?
If the language stops being spoken then there are no people who speak them, and asking what something means for those nonexistent people is kind of weird.
I'm thinking that the loss of distinct languages in active use is not necessarily a bad thing overall. It means more people can communicate with each other more widely. By all means document these disappearing languages as much as possible before they're gone, but there's likely a good reason most of them are disappearing.