If your unsubscribe isn’t working, report them to the FTC: https://reportfraud.ftc.gov/#/ If you take want to go the extra mile, report them to their email provider as well. You might be able to get their email shut down, and if their email provider is also their web host provider, maybe their website as well. Providers take CAN-SOAM violations seriously.
Obsidian.md. It runs on markdown files, so even if you decide you don’t like Obsidian, you’ve still got all the files. It’s super easy to sync with SyncThing or probably Google Drive or whatever. It’s free, and the are a ton of plugins for it. Peri sure there’s a Lemmy community for it around, too.
That’s a great point, thanks for adding it!