I notice that all mailing list have a notice from Protonmail that says "This message is from a mailing list" so clearly Protonmail knows which emails are from lists.

It would be great if you could filter on "mailing list" emails so that I could say create a filter that moves all mailing list emails to a specific folder, so that I can not have my inbox cluttered with them.

There's several services to have them sent to different emails, throw away emails, etc. but you can NEVER get rid of email lists.

And there are a lot that I would really not want to get rid of them just not have them clutter the inbox and making individual filters for each sender is a hassle that I won't spend time on.