It's evident that God established giving according to the heart in the New Testament. Calling it a law is complex, because if it fails in any case, it would no longer be a law, since laws "are always fulfilled." In TWI, at least in recent years, when a person tithed and didn't get results, contradictory excuses arose, such as:
"They are giving without the love of God in the renewed mind in manifestation."
"They are giving without believing"
"They are giving out of compulsion."
Ultimately, it's a vicious circle, because TWI's entire belief system is based on another principles that VPW developed (or plagiarized). Tithing and Abundant Sharing are based on the "law of believing" and the love of God in the renewed mind in manifestation, and others. If one fails, it's because the other is failing, and so on. The central issue is that these three main beliefs or principles are not 100% biblical and generate condemnation in people.