It’s admin settable. So just sudo homectl it. You are presumably admin.
It's entirely optional, I get that. I could 'just' not set anything. Spare your fingers. I want to poison it [or loudly opt out] without a lot of effort. This includes running N commands when a file to could effectively disable the signal.
Said differently: I don't want to configure the portal, I want to ~~break~~ mask it.
A few years down the road it might not be.
In late 90s we would have laughed if somebody proposed this was going to be a thing, let alone that linux community will just go with it. Heck, I would not have believed systemd was going to happen.
And yet, here we are.