Definition of spam is irrelevant or inappropriate, the stresstest is neither. The ST is showcasing BCH capacity, proving to merchants BCH does scale, this will bring Natural Velocity.
when I learned the definition of 'spam' , that was an a'ha moment, paying to transact is more like an assurance that the system functions as designed, to prove it works.
Load testing is a normal part of development of network service technology. These tests have been done in development instances, but we need to do it in production as well.