For posterity since the term has been misused lately, having a very good product isn't a moat in the business sense. There's nothing stopping a competitor from creating a similar product (even if it's difficult), and there's nothing currently stopping OpenAI's users from switching from using Sora to a sufficient competitor if it exists.
Sora is more akin to a company like Apple/Google a decade ago using their vast resources to do what a third-party does, but better (e.g. the Sherlocked incident: https://www.howtogeek.com/297651/what-does-it-mean-when-a-co...).