Currently that's 10% of a month's income, not exactly trivial. They make an excellent products, but I probably will move to a FOSS solution if I find one so I can use it for work.
An Obsidian license is $50. That'd mean a monthly income of $500. There's a good chance that means you're working by yourself, so I'll flag that Obsidian only requires a commercial license if the company has two or more people.
Paragraph 1 in the EULA - https://obsidian.md/eula - say "You need to pay for Obsidian if and only if you use it to contribute, directly or indirectly, to revenue-generating, work-related activities in a company that has two or more people"
Nope, I'm an on call remote consultant without a lot of hours at the moment, because I just moved somewhere without many opportunities for those who can't drive, and I don't have any income at all that isn't tied to a 5+ person company.
