One important limitation involves payments. ChatGPT Sites can be used to sell goods or services, but it cannot directly process a customer's payment-card information. Payments have to be handled through a third-party payment processor.
That distinction matters. Connecting Stripe or another payment service may make it possible to accept money, but the payment processor is only one part of a photography business. You may still need to create and manage products, packages, taxes, order fulfillment, refunds, receipts, and whatever happens after the transaction.
A photographer selling a $300 portrait session may only need a simple payment link. A studio selling sessions, prints, digital files, albums, packages, and gallery products has a much more complicated problem.
ChatGPT Sites also does not register a domain for you. If you want your site to live at your own domain, you need to purchase and manage that domain somewhere else, then connect it to your site using the appropriate DNS settings.
There are also limitations to what can run inside the Sites environment. ChatGPT Sites can support more advanced functionality, but OpenAI's documentation notes restrictions involving certain frameworks, networking behavior, background services, and hosting patterns.
Most photographers will never notice those limits while building a portfolio. They become more important when you start trying to turn the website into a larger business application.
It's like building Legos on top of already arranged Legos, expecting the to carry the burden, might work for a while but then it becomes something completed different, and when you change something buried below the new blocks, you have to get to that source.
Usage is another consideration. ChatGPT Sites is still in public beta, and usage limits apply across the Sites connected to an account. Those limits may affect creating additional sites, storage, or keeping a high-usage site publicly available. OpenAI also notes that those limits may change during the beta.
That probably isn't a big concern for a temporary landing page. It is worth thinking about differently if your primary business website becomes something your clients depend on every day.
OpenAI also states that ChatGPT Sites does not currently provide data residency controls for hosted Sites and related storage. Most photographers may never need to think about that, but photographers working with organizations that have specific corporate, legal, government, or privacy requirements may.
There is also a very simple limitation worth knowing: if you permanently delete a ChatGPT Site, OpenAI says it cannot be restored.
That makes backups and version management a little more important when your website is part of your livelihood.