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 have a big jar at home putting all copper coins into it out of my wallet from time to time …
Some stores provide the possibility to round up the sum and donate the difference to a charity. I think this is also a good idea.
Some banks also have coin deposit machines