Not having to paste is very useful. Especially on mobile where pasting is slow and tedious.

A few months ago I would have said the same thing as you, but then I experienced some applications which looked at what I had copied and automatically did all the hard work. It's a pleasant surprise to see it happen, and having experienced it, I am happy that the applications have this functionality.

Of course if you're living in a world where all the code on your device is considered hostile, then you may not want this. But I use almost only free software and there you can generally start with a presumption of goodwill instead of starting with a feeling of distrust, like with TikTok.

I mean, sure, you're technically correct, but you're missing the point. For just one example, it's so heckin' convenient when an app recognizes that you have a 2FA token in your clipboard copied from your 2FA app and "pastes" it for you automatically.

Yes, but this is still convenient. For example, Pocket (a read-it-later service) checks your clipboard when you open the app. Normally to add a new URL to your reading list, you need to tap through a menu or two from the front page of the app. But if it detects your clipboard has a URL on it, it provides a small one-tap "Add this copied URL to your list?" button at the bottom of the screen, reducing the friction.

Google/Apple maps does this too; if you've copied an address and then open them it offers you the copied address as a suggestion (usually with a clipboard icon) or as an option to navigate to instead of having to copy/paste manually.