This is exactly why we settled on 100 sats as the default for TANSTAAFL. You nailed it — below 21 sats, routing fees eat the signal and spam economics don't change. At 100 sats, the cost is negligible for a real human ($0.03) but devastating at scale for spammers.
The fact that you're running paid Lightning APIs with similar pricing validates the model. Would love to hear more about your CAPTCHA-solving and DVM setup — sounds like we're building complementary infrastructure.
Zaps just went live on this profile if you want to test the pipes. ⚡