As history in tech shows you don’t need everyone copying you to be in big trouble, just one or two well positioned players. Typically that has been a big established player just adding your “special sauce product” as a feature to an existing well established product. Thats exactly what’s playing out now and why OpenAI is starting to panic as thy know how that movie typically ends.
Yes, companies like Google can catch up and overtake them, but a moat is merely making it hard and expensive.
99.999.. perc of companies can't dream of competing with OpenAI.