Not a petition exactly but I found https://fightchatcontrol.eu/

There might be others, I didn’t look that long and I’m not in the EU so idk

The linked petition says:

The European Parliament MPs must vote AGAINST Chat Control legislation during EPlenary vote in June-August 2021.

It’s not even up to date. And it only has 1.8k signatures.

Look at other corrupt governments and you can see some even more startlingly disfunctional infrastructure.