The criticism of the British royal family grew when a BBC study revealed that public spending for the Royal Household had increased in real terms since 2012.
According to the BBC, the rise in funding was mostly due to renovations and construction at Buckingham Palace.
Republic, an anti-monarchy party, has exploited the research to fuel its campaign against King Charles and his family, calling for the monarchy's abolition from the United Kingdom.
The group is promoting the findings and the criticism it has received on its social media sites, particularly X, previously Twitter.
It also staged a rally in Trafalgar Square, London, advocating for the King to be replaced with an elected, democratic head of state.
Meanwhile, Republic's CEO, Graham Smith, spoke with British broadcaster GB News and targeted Prince William, King Charles' eldest son and successor to the British monarchy.
He stated, "Part of the problem with them, and part of the problem with William, who is on track to become the next monarch, is that he is terribly indolent. "He does nothing."
Smith stated, "In the previous month, he worked around four days. When I say work, I mean showing up and waving to people. Most of this is done at or near their homes.
He said, "They cost us. They cost us a half billion dollars each year. This expense includes a full family, which we do not need, as well as people most people have never heard of.