itch.io

Either start with 15k+ to dump into advertising, or get a girl into dizzy's underground facility, and collect the dizzy dollars and stack them into advertising (there's a buying option for specifically dizzy dollars).

Hire feeders. You'll see the specific description like "She keeps everyone well-fed"

"Priming the pump" on the Dizzy's cash machine is a lot easier if you have a bunch of income from elsewhere to funnel into advertising. I recommend going slow and steady, knowing that your first successful franchise will make subsequent ones quicker, or 'prime the pump' with a bunch of OnlyFats income.

Be level 20. Have an OnlyFats account yourself. Make content and use the massive cash flow from that for advertisement for Dizzy's. Just tested this myself and it works. Being level 20 unlocks Medical Miracle which allows you to lose weight yourself, while eating like a piggy for the OnlyFats.

Also the level 20 skill helps lure feeders into being blobs. As you can just lose the weight yourself with a dedicated few days of nothing but weight loss pills from the pharmacy.