Royalty

Yeah but tourism

The only argument with any legs is "yeah but contributions to the treasury".

On that measure alone, if you don't what-about-ism their tax status, is at least a semi argument for them getting a free pass. At least you can measure the treasury earnings, unlike the tourism thing which has always been vague at best

I personally couldn't give a toss whether the existed or not, as long as they are a large financial net contributor and don't harm anybody which I appreciate is an arguable point to some extent.

Let's face it, the UK will never seize their assets and give them to the people. They're not going anywhere.