[bdcravens]

These are solo founder businesses. Many of the examples hired employees. If you have a boring b2b SaaS that charges $100 a month, you only need 1000 monthly customers to gross $1M a year. You don't need a personality, you need a decent funnel.

[cvhashim]

Assuming B2B. Can one individual manage the demands of 1000 clients?

[bdcravens]

No. If you look at the article however, many of the examples have employees.