I think the discussion has drifted a bit so I wanted to post a reply specifically supporting this option (https://obsidian.md/privacy-statement does not mention anything yet.). I am happy to pay for Obsidian if I find it to fit well into my workflow. Everyone lecturing @Silver on how to develop a product should look at Evernote, Notion, and Roam, which seem to be doing well. I want the same for Obsidian (both because I am rooting for @Silver and @Licat and because I want the tool I will use for many years to be sustainable and supported). Note that all of those tools not only keep the source closed but also have a proprietary note format.
For the context, I am a paying user of Dynalist Pro (I am assuming @Silver == Erica at talk.dynalist.io, thank you for Dynalist!) and I am making small donations to https://logseq.com/ for that exact reason: I want to know if the company loses interest in the project (either financial or just sells the company), I will not be left with a broken workflow. I especially became conscious about this after spending quite a while migrating CI scripts from Travis across all my OSS projects to GH Actions (unfortunately, they are way more powerful than Gitlab CI and some projects cannot simply move from Github for org reasons but it’s good to know there is an open alternative). This reminded me that free lunch does not last forever.
This! 1000 times. If you want to see the difference, try asking for support on a large OSS project (I myself have mastered how to say no politely: “Thank you for filing this issue! I am focused on other things right now but I will be glad to review and merge your PR.”). Then sign up for a paid account on Dynalist and ask Erica for help! Night and day!