The open source-adjacent licenses such as BUSL are fine as long as you don't attempt to tout your product as actually being free software or open source. That

The open source-adjacent licenses such as BUSL are fine as long as you don't attempt to tout your product as actually being free software or open source. That would be fraudulent. Make it clear that you are producing another proprietary product for which you expect to get paid and with source availability as a bonus, which is what open-source adjacent licenses like BUSL are, and the so-called "haters" will not bother you because you're not attempting to intrude on their territory.