There are plugins allowing you to sync via other means (for free). I don't know how the author fails to realise/mention this. I've been using Remotely Save with WebDAV or years without issue.

And the notes are all just markdown files. If the obsidian software were to disappear you have all your notes. It's fine someone wanted to spend a load of time writing their own software but none of the reasons presented in this piece make sense.

It's not wasteful to support great software.

For me it was the It Just Works-iness of it combined with a handy way to support the project cheaply.

As long as I'm paying for it, I'm the client and not the product.

I tried some of the third party stuff, iCloud, Dropbox, etc and with all of them I either lost data because of notes not being in sync or had to manually fix stuff. $4/month and zero issues was well worth it for a tool I literally use every day.