Many people exploring BH methods don't have a longer term time horizon or understanding of the concepts, hence they have trouble maintaining good results. Black Hat is a risk management issue, not a set it and forget it issue. In recent years White Hat has also increasingly become a risk management problem, as Google has complicated maintaining stable rankings with repeated updates, algo changes and features (AI et al) that have demoted SEO's ability to have an evergreen impact on holding onto relevant traffic at a predictable level.
Right thinking applying BH involves baking cycling or switching out methods in order to beat G in detecting them. Successful scheduling of this activity can be achieved by trial and error in dynamic campaigns, or knowing that most things have a shelf life. It's like using a model in her twenties to sell clothes, but expecting her to still work into her 50s, or ordering food supplies for your restaurant but thinking they will stay fresh for years.
Ongoing contingency planning is needed to use BH to cover for these limitations, and to not always use methods to achieve search engine results 9say, just do them at time to explode short term direct traffic, regardless of its long term ranking impact. Because increasingly, there is no such thing as stable, permanent or long term ranking status, even if you use White Hat exclusively.