I will not promote

I do LinkedIn personal branding and I got referral from one of my early days client she helped me connect with a VC firm, and they want to start another venture or the same service and they plan to sell the company once it’s valuable is 50cr+. It’s been 6 months since we are in touch. They will be a great lead source coz they ofc have a lot of founder and startups under them. But I’m confused if I should do it with them. A few business people I’ve asked the same question said that I should not let anyone le