> if you want to start a business building developer tooling and you’re concerned about competitors using your work, you should probably start source-available (BSL) and then go for a license that is OSI-approved

To put another way, if you want to start a business, make sure what you're selling you can do better than others. If your business is hosting open source software and you can't do that better than others, then don't make that your business. Maybe you should have been selling non-open-source instead (which they pivoted to now anyways).