Those are often impossible to tell apart, especially not with an algorithm.
- "My husband and I loved the boat tour we took along the Amalfi coast. We found niceboatservices.com an excellent service to book our tickets. (History: genuine user)
- "My husband and I loved the boat tour we took along the Amalfi coast. We found niceboatservices.com an excellent service to book our tickets. (History: user with an AMA about having started a new boat services website)
- "My husband and I loved the boat tour we took along the Amalfi coast. We found niceboatservices.com an excellent service to book our tickets. (History: brand new user's very first post on reddit)
Admins complaining about subreddits removing very new users are simply not familiar with the kind of challenges subreddits like /travel face.