Comment by kelnos

And that's totally fine what Lovable is doing. Tailwind offers an MIT-licensed library that anyone is free to use without paying for it. Tailwind's paid offering is optional, and many businesses won't need it. Just as non-paying users of OSS are not entitled to anything from the maintainers, maintainers are not entitled to revenue from users who are complying with the license terms of their free offering.

As an open source developer myself, it concerns me that so much of what we do us under- and un-funded, but that's the licensing model Tailwind chose. If you want something different, then release it under the AGPL (or something else that businesses aren't comfortable using, or cannot use), and charge for commercial licensing for any use of your product. Yes, you'll have fewer users, but that may be the trade off you need to make in order to build a sustainable business.