In general, most firms form relationships with marketing lead generation companies. i.e. you pay for customers interested in buying something, and pay a reward if a sale is made.

Don't bother spamming with FAANG, as the conversion rates are still hypothetical for many. Go to trade shows, and note how sales people operate with the public... hint, the big deals are never done on the floor area.

The sales conversion rates and tax postures will determine if this type of business is viable in your area. =3