Using Instagram links in bio for weight loss offers

It seems like every weight loss / keto IG profile out there links to a weight-loss supplements (the ones that pay $50+).

If anyone's open to sharing, I'm curious how that strategy (of just pushing people to that link in the bio with everyday types of posts.. seems like a numbers game) actually converts.

Thanks

They must be very well known and have tens of thousands of subscribers for all of them to see this thing honestly. I do not believe what makes people click links in their bio so much that it would bring real money for them absolutely.