Ad networks and affiliate programs often require a custom domain for approval.
Subdomains look less credible to customers.
If you leave the platform, you cannot take that subdomain with you.
Many paid website builders and web hosting companies include a free custom domain for the first year when you purchase their hosting plans. ⚠️ Drawbacks of Free Subdomains
No, you do not always have to buy a domain name, but it depends on your specific goals. 📌 The Short Answer
You do not need to purchase a domain name in the following scenarios: