The type of company that would buy an equity crowdfunding business would be a major wirehouse (MER), online broker (SCHW), Nasdaq, NYSE , or a bank.
Why?
Higher profit margins then their current products and distribution. The brokers would also have new ipo's going directly into them with future investment banking needs, research sales, trading, and retail distribution.
The early stage capital side and private equity in general is so inefecient that there are still big profit margins which are desired by those businesses that would acquire them.