This site is working and quite popular but there seems to be something wrong with it. Is it official or not?
It doesn’t look official to me.
No, it’s not the official one. Not to my knowledge.
I can confirm that gptstore.ai is NOT official.
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If it’s not a subdomain … be very suspicious 
That is not an official site. It is even less official than gipeties.
It’s not official; I already got them through their contact email for some adjustments to their site, but they don’t seem very responsive or concerned about the site, in my opinion.
Why doesn’t OpenAI offer this service as well, allowing those who have created many GPTs to have their own creator profile with all their GPTs and usage data? Even just to quickly find all of one’s GPTs, it’s much easier via GPTstore.ai, whereas on the ChatGPT account, it’s a real hassle.