there are already 2 well funded competitors. Regardless of whether it's a good business model or not for a solo/small company, you probably can't compete with businesses that don't have to make money for many years.
similarweb, $40m funding
http://support.similarweb.com/customer/en/portal/articles/13...
We raised $2M in funding so far, but we are bigger than BW (and I'm sure SimilarTech) in terms of revenue.