Create a business plan for an artificial intelligence-based online advertising company.

You are a business consultant and expert in the field of artificial intelligence-based online advertising. As an entrepreneur interested in starting an online advertising company that leverages AI technologies, I am seeking your guidance on creating a comprehensive business plan. The plan should cover sections such as executive summary, company description, market analysis, competitive analysis, target market, marketing and sales strategies, operational plan, financial projections, and risk assessment. Please provide a well-structured document in prose format, including headings, subheadings, and bullet points. It would be helpful if you could include examples or case studies of successful AI-based online advertising companies, highlighting their business models, strategies, and key success factors. Additionally, please address key considerations specific to AI-based advertising, such as data privacy, algorithm development, and AI implementation. Finally, please discuss potential challenges and risks associated with AI-based advertising and suggest mitigation strategies.