uninstall dropbox fails and doesn't clean everything up

[onlynone]

Output of brew config

HOMEBREW_VERSION: 5.0.16-59-g45a6f3a
ORIGIN: https://github.com/Homebrew/brew
HEAD: 45a6f3afb74af996a2b8f6aecf253042cf888108
Last commit: 9 hours ago
Branch: main
Core tap HEAD: e70a73e43c8014329d54ea7c63bad8b58fe6c5f5
Core tap last commit: 19 minutes ago
Core tap JSON: 22 Jan 20:49 UTC
Core cask tap HEAD: ab0b9d2a9e5271556af0250280845c01bb0c20d2
Core cask tap last commit: 2 hours ago
Core cask tap JSON: 22 Jan 20:49 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_DOWNLOAD_CONCURRENCY: 32
HOMEBREW_EDITOR: emacs
HOMEBREW_FORBID_PACKAGES_FROM_PATHS: set
HOMEBREW_GITHUB_API_TOKEN: set
HOMEBREW_MAKE_JOBS: 16
HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK: set
HOMEBREW_NO_INSTALL_CLEANUP: set
HOMEBREW_NO_INSTALL_FROM_API: set
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 4.0.1 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/4.0.1/bin/ruby
CPU: 16-core 64-bit arm_brava
Clang: 17.0.0 build 1700
Git: 2.52.0 => /opt/homebrew/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 26.2-arm64
CLT: 26.2.0.0.1.1764812424
Xcode: N/A
Rosetta 2: false

Output of brew doctor

brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Some installed casks are deprecated or disabled.
You should find replacements for the following casks:
  chromium
  gstreamer-runtime
  session-manager-plugin
  wine-stable

Warning: Some installed formulae are deprecated or disabled.
You should find replacements for the following formulae:
  ruby@3.1
  terraform

Warning: You have unlinked kegs in your Cellar.
Leaving kegs unlinked can lead to build-trouble and cause formulae that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
  terraform
  opentofu

Warning: Broken symlinks were found. Remove them with `brew cleanup`:
  /opt/homebrew/etc/httpd/extra/nagios.conf
  /opt/homebrew/opt/httpd
  /opt/homebrew/opt/nagios
  /opt/homebrew/opt/php
  /opt/homebrew/opt/php@8.5

Description of issue

Running brew uninstall dropbox results in these errors:

==> Uninstalling Cask dropbox
==> Removing launchctl service com.dropbox.DropboxMacUpdate.agent
Password:
==> Unloading kernel extension com.getdropbox.dropbox.kext
Executing: /usr/bin/kmutil showloaded --list-only --bundle-identifier com.getdropbox.dropbox.kext
No variant specified, falling back to release
Can't read info dictionary for /System/Library/DriverExtensions/com.apple.DriverKit-UVCUserService.dext: IOCFUnserialize: syntax error near line 1.
==> Removing files:
/Library/DropboxHelperTools
/Library/Preferences/com.getdropbox.dropbox.dbkextd.plist
==> Backing App 'Dropbox.app' up to '/opt/homebrew/Caskroom/dropbox/243.4.6956/Dropbox.app'
==> Removing App '/Applications/Dropbox.app'
==> Purging files for version 243.4.6956 of Cask dropbox

And it leaves these processes running:

$ ps wwaux | fgrep -i drop
<MYUSER>         90235   0.0  0.1 435429344  39808   ??  Ss   12:29PM   0:00.19 /Applications/Dropbox.app/Contents/PlugIns/garcon.appex/Contents/MacOS/garcon -AppleLanguages ("en-US")
root             89264   0.0  0.0 435347872  11648   ??  S    12:19PM   0:00.33 /Library/DropboxHelperTools/Dropbox_u502/dbkextd

Relevant casks

dropbox