I can (it's really obvious here) and wish I couldn't. Every time I run into something I might wanna read, but it turns out to be LLM "assisted" writing after I've already invested some time, it feels like I was tricked into eating cardboard.

And when I bring up that this should be clearly marked, preferably up front, it's often taken as a personal slight.

I realize this is a me problem to some extend, I shouldn't feel strongly about this, but I do.

> I can

You can guess, but there is no single objective test that is 100% accurate.

There are some very small tells, like the constant "rule of threes" that AI loves to follow, but you're right that this is much harder to tell than it used to be.