Unable to disable Siri in iCloud on iPhone

iOS 18.2.1

iPhone 14 Pro Max

Condition:

Siri shows "Others - 1 of 2" in iCloud > Manage Storage > Siri though I never turned it on

The steps I followed:

• Settings > Apple Account, iCloud, and more > iCloud > Storage > Siri > Disable and Delete
  • Result: spinner just spins
• Signed out of iCloud and signed back in
  • Result: repeated above step after signing in and same result

I never activated Siri so it appears to have turned on when 18.2 or 18.2.1 update. The setting the appears to be automatically on with the update is in Search "Help Apple Improve Search". I don't recall seeing that before, though surely I would have turned off if I did. Everything under Settings > Search is off, including in each app listing on the Settings > Search screen.

I may just sign out of iCloud on the phone until this gets resolved. Though I generally trust Apple, data breaches are the norm.

NOTE: I initially responded to this question that related to an iPhone 15. Reposting to clarify my experience is with an iPhone 14

[Re-Titled by Moderator]