Taxpayers money is used for funding the royal family.
Look it up.
"released in June of 2022 show that they cost the taxpayer £102.4m during 2021-22 – an increase of 17% from the previous financial year."
https://britishheritage.com/royals/royal-family-cost-british-taxpayer#:~:text=Ever wondered how much the,from the previous financial year.