B2C SaaS: Subscription products sold to consumers; e.g. Duolingo, Spotify, Grammarly
B2B SMB + Mid-Market: Subscription products sold primarily to companies with fewer than 1,000 employees, generally charging less than $1K per month for the average customer; e.g. Gusto, Intercom, Airtable, Asana
B2B Enterprise: Roughly defined as subscription products sold primarily to companies with more than 1,000 employees, generally charging more than $5K per month for the average customer; e.g. Salesforce, Snowflake, Workday, ADP
First princples 