It depends on the niche.
Some niches use formats that are basically robotic, predictable, and format-driven.
The only way you can tell really if it's original content is to determine if it's readable.
Also, look for idiomatic expressions or sayings that native English speakers normally use.
But for more free-form content, automated content sticks out like a sore thumb.
Why?
Generally speaking, artificial intelligence or machine-learning-based content generation tools can't tell stories. Start there.
They don't have insights. They don't get triggered by memories or free-form associations that involve some sort of emotional narrative.
And you might be thinking: "Well, this stuff doesn't really count. How does this matter?" It does a lot, especially if you want to sell stuff online.
You have to understand that for people to buy anything from you, whether it's a product or a service, they must first trust you.
You can take that to the bank.
Without trust sales are impossible. It's not just gonna happen.
And how do we get from stories to trust? Again, it's all about human psychology.
Because every single second, we pick up all sorts of stimuli from the outside world. We take in these neutral stimuli based on what we see, hear, touch, taste, and smell.
But there's got to be a way for us to organize all this information that seems to hit us from many different directions at once.
And oftentimes, we've taken all these stimuli at a rate of a thousand miles per hour. This is where stories come in.
You're able to relate things that you take in on a day-to-day and week-to-week and month-to-month basis to paint a story.
And this story shockingly enough resonates with many people because, despite our differences in appearances, personalities, world views, politics, or whathaveyou, we have a lot more in common than differences.
So when you put all these together and you speak "the same language" through your website's stories, people can trust you more.
Sadly, AI content has a long way to go when it comes to story-driven as well as persona-driven content. I'm not saying it's not gonna get there, but it's definitely going to be an uphill climb.