Couple reasons come to mind: 1) The institutional apparatus required to maintain the monarch as head of state is reasonably complex and expensive, both from a legal point of view and in a financial sense. The governor general is an unelected official whose power technically exceeds any democratically selected person in our government, and they make almost $300k/yr to do essentially nothing but administrative ceremony. I know that in the big scheme of things, $300k (plus whatever other perks/bonuses they get, along with their staff) is just a drop in the bucket, but it feels a bit like theft from Canadians given this role doesn't need to exist at all. https://en.wikipedia.org/wiki/Governor_General_of_Canada

2) The royals do have a bit of a history of interfering in the politics of past colonies - the recent reveal a few years ago that Charles (I think...?) influenced the selection of high ranking Australian government officials in the 80's was a bit of a shock to many. Apologies, I can't find the right combination of phrases to yield anything in google except tabloid nonsense as a source. In any case, there is at least some evidence that the royals, either through wealth, old-school power politics, or direct action do play about with the politics of other countries, even when they explicitly should do not that. I detest this.

3) I really do not like what the royals stand for. Monarchism, colonialism, genocide, general crumminess. Spending £12 million to pay off one of the women Prince Andrew allegedly sexually assaulted as a minor, using public money, is an atrocious act and one I still cannot believe got so little media coverage here. Then there's all the general petty money issues: Prince Charles doesn't pay inheritance tax (why? Because, that's why). The royal family is except from all sorts of laws pertaining to wealth transfer actually, in some cases literally because it's coded into the laws themselves that Her Majesty is excluded. It's ridiculous. And here in the UK you still are not legally allowed to protest the monarchs. I mean - you can, but you can also be arrested for it. Just in the last 2 days there's been outcry as 2 people were arrested for anti-monarchist protest signs.

https://metro.co.uk/2022/09/11/woman-arrested-after-holding-... https://www.thenational.scot/news/21319718.protester-arreste... https://twitter.com/standardnews/status/1569270901685862403?...

It's time to let go of the past, try to build a future for ourselves that doesn't centre around the absolute worst parts of our collective histories.