[nitrogen]

That can happen with BSD software, too. Thr LGPL only gets more restrictive if the author releases a new version of their library that only permits the new LGPL version. Any project can change its licensing at any time, but with most open source licenses you retain your rights under the old license.

[CCs]

Yes, it can happen with BSD and MIT. But at least you can start a fork from there, if you really have to. Forking LGPL stays LGPL, with the limitations & all.