They’re not worth anything, never were but even less through the years with inflation.
If a store wants to sell something for 99 cent, they can either just take 1€ or 95 cent.
Maybe even 5 cent pieces? But that would be a bit radical.
I am a bit annoyed that easy ideas like this are never discussed in politics, or wherever. It would make our lives just a little bit easier, and having them achieves NOTHING.
I used to live in Finland for two years. The shop close by to my home wouldn’t accept 1 or 2 cents so I just put them in a drawer and never worried about it again. Don’t know if they are obliged to accept them.