I can like the idea of the BSL.
I have no problems seing the justification for that.
What certain people does, that makes me and others react is when they insist on their commons clause licensed applications or libraries being open source.
However, many contracts don't follow a template and it's normal in other contracts for items to be customized to any extent required. Template licenses are often used to intimidate people who aren't aware of their rights and what is possible. For example, employers may say that they can't modify an employment agreement because it's a standard template to make the potential employee feel like there is some legal rather than policy issue at play. Similar things happen in other places and you have to decide how much you want to fight policy, but parties almost always have the option of agreeing on custom terms.
This is hard today in the OSS ecosystem, but it'll have to evolve to support additional terms.