Just to birds, of course. We have nothing to worry about until 15 years from now that we learn burning teflon causes some poorly understood conditions the maker knew about all along. Ban it already. https://theintercept.com/series/the-teflon-toxin/
What could be a better alternative to non-stick pans?
It's not clear how convenience is even part of the equation. It's not their proper use, it's the manufacturing of teflon, the disposal of used cookware and use of it when scratched. What's better than non-stick cookware? Literally anything. Teflon is a scourge.