I agree that Google isn't great at creating products anymore, but I'm not sure that OpenAI is. We've seen relatively simple products by them (a chat app, a short-form video app, various web interfaces) but we haven't seen anything as complex as some of Google's bigger products (Gmail, Docs, Maps, etc).
If OpenAI hits jackpot with a "simple" product, it could be easily replicated by a bigger company in the way Meta quickly copied Stories from Snapchat or TikTok to make Reels. It's already happened with Chat; the LLM is hard to compete against but the actual product, a web/app chat interface, was quickly copied by other companies with LLMs.
OpenAI would need to make something very complex and hard to copy to give it a solid head start they could really build a moat around— something like Google Maps, which took Apple years to replicate (and other companies won't even try to) or the iPhone, which was years ahead at launch. I just don't think we've seen OpenAI prove it has the capacity to build a product like that yet.