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The Raspbian system which runs on the Pi comes with a package called "unclutter". This hides the curser after a few seconds. All I have to do is install the package, and start the app. Right?

Let's see if that can be automated. First I install the package, using Ansible:

- name: Install unclutter package
  apt:
    name:
      - unclutter
    state: present

That part is easy. Starting it requires multiple steps. First I need a ".desktop" file containing additional information for the desktop manager:

[Desktop Entry]
Name=Hide Mouse
Comment=Hide the mouse after a few seconds
Exec=/usr/bin/unclutter -display :0 -idle 5 -root -noevents
Type=Application
Encoding=UTF-8
Terminal=false
Categories=None;
Path=/home/pi

This hides the mouse cursor after 5 seconds of inactivity. If someone moves the mouse, or touches the screen, the mouse cursor reappears again. The used LXDE provides a folder which will autostart elements in it, once the desktop starts. For that, you need to create a ".config/autostart" folder (not there by default) and place the .desktop file in it:

- name: Create LXDE autostart directory
  file:
    path: /home/pi/.config/autostart
    state: directory
    owner: pi
    group: pi
    mode: 0700

- name: Copy unclutter.desktop to autostart
  copy:
    src: '{{ playbook_dir }}/files/unclutter.desktop'
    dest: '/home/pi/.config/autostart/unclutter.desktop'
    owner: pi
    group: pi
    mode: 0755

That's it. Next time the Pi starts, the mouse cursor disappears after a few seconds.