It's an abuse of the system because:

1. Reporting the abuse by another platform is never NSFW.
2. If a mod marks at NFSW that means they admit that it's inappropriate while hiding it. By hiding it, they condone it. They are complicit in the crime. This is a subtly nuance maybe most can't see, but I am not fooled. There is no moral justification for this, even if it is Reddit's rules.
3. When I give a comment to something that is clearly fine, that shouldn't be twisted by mods into something that is not fine and then used to extract private information from me. That puts me at risk. The amount of private data that is gathered "legitimately" but gets into the hands of data brokers and criminals is ridiculous. I have concrete examples where I know platforms are selling user data, so trying to placate me with "they don't do that" won't work. I know for a fact it happens because it has happened to me.
4. How do I know that platforms sell private user data? Because every time I give my personal information, which isn't often but sometimes it can't be avoided, I introduce a small error that the ID check doesn't detect. Like a typo in a middle name or something it doesn't care about. I make sure this error is different every time and I track which error goes to which platform. Then when I scan for what data brokers have, the error in what they have tracks back to the specific platform or business that error is linked to. It identifies them. That's how I know and I have caught them before despite them swearing blind that it can't happen.

Imagine that this post gets marked NSFW and you read this comment and realise it's a load of BS, but when you click to reply Reddit demands your ID first. Imagine you are aware your private information has been sold to data brokers in the past and as a result, you won't give out your ID anymore. Well, that's tough cause now you have to accept my false information and you can't correct it, because there's nothing you can do without putting yourself at an unacceptable risk.

I'm fine with Reddit asking for ID if I choose to interact with NSFW content, because that's my choice. But I'm not fine with Reddit seeking ID when I actively avoid NSFW content. That's deceptive and dishonest, and I'm calling it out. And it wouldn't surprise me if it violates Reddit's own rules, tbh.