A question about copyright

[Jubulu]

I've name changed as this is potentially outing but wanted to gather opinions.
So I follow someone on instagram (who is lovely and I love her content) and she started a new business idea last year and yesterday they released a statement along the lines of 'our products are trademarked and copyrighted, please be original. Those who are copying will received a letter' etc... I've paraphrased.
Anyway, I was wondering how does it all work?
The stuff they are selling I could literally find anywhere, things like plain tote bags with writing printed on it. And so on... to me they aren't original. It isn't to say I don't like the products, but they aren't a completely new idea. So I wondered what happens exactly with copyright? Surely ideas start somewhere?!

I want to add i really do like this person, I just wondered how the whole copyright thing works?!

It'll refer to the actual slogans, not the idea that they are printed on objects

The designs on the products not the idea.

Ah okay, thank you! I mean, a quick look on etsy I can find pretty much the same stuff they are selling (I'm not bothered by this) but just feel that they can't then expect others not to have the same. I find the whole copyright thing confusing!

There has been a lot of this on Instagram lately and I think it’s a tricky area. There was a lovely small business who have been making signs. A much larger business with thousands more followers have copied it and are selling more. The first first business have been vocal but not named the higher company publicly!

I have a small online shop I run part time, I've seen products that are clearly inspired by my design, I don't care about that. But people who straight up take my design and slap it on their product, hear from me.

Tis bullshit - it is very very hard to protect designs in court - all creative ideas borrow from others, and the legal system acknowledges that. So to protect something you’d have to do something demonstrably original in the first place, which almost impossible, and then the person copying you would have to do something exactly the same, rather than tweak it to cover themselves, and then you’d have to go to court which would be hugely expensive, with no guarantee of winning...

So they are just trying it on, but they might not understand copyright law enough to know that.