Doesn't the monarchy have to pay a lot of money for maintenance on the properties that they "own", which the government would have to pay instead if it was confiscated?
The Gruanidad has been running a series on this (especially nice to see in the run up to the coronation) https://www.theguardian.com/uk-news/series/cost-of-the-crown
In particular, from here, https://www.theguardian.com/uk-news/2023/apr/07/british-roya...
> Elizabeth II and Charles III have extracted cash payments worth more than £1.2bn from two hereditary estates that pay no tax, in addition to the millions they receive in public funding for their official duties. In 2022, they received £21m each from the duchies of Lancaster and Cornwall respectively, despite a centuries-old debate over whether the two estates in fact belong to the British nation.