Interestingly in the marketing space (in particular, email-based marketing), all the tools I gravitate towards have been bootstrapped rather than funded: Mailc

Interestingly in the marketing space (in particular, email-based marketing), all the tools I gravitate towards have been bootstrapped rather than funded: Mailchimp, ConvertKit, Drip (altho lead pages bought it, and is actively funding it's growth), curated.co (I'm not 100% sure on Curated - is that funded?), Edgar These types of apps can actively and easily translate into $$ for businesses, so it's no wonder they can bootstrap rather than take on funds - individuals and businesses are willing to pay to make money!