1. Product Hunt
It’s a vanity metric now. It brings "tourists," not buyers, and the traffic bounces in 48 hours.
2. US Paid Ads (Meta/Google)
Unless you have $50k to burn on pixel seasoning, competition and ad-blockers will eat your margins.
3. B2B LinkedIn Ads
CPAs are mathematically unsustainable for a bootstrapped or seed-stage 0 -> 1 product.