How can I remove TickTick's icon from the menu bar? TickTick will not allow their users to remove its icon from the menubar in macOS. How can this be done?
Run this command in Terminal:

strings -ao /Applications/TickTick.app/Contents/Resources/Assets.car | grep menubar_icon_task@2x.png | awk "{print \$1}" | xargs echo 232+ | bc | \
xargs -I{} echo "printf '\x01' | dd of=/Applications/TickTick.app/Contents/Resources/Assets.car bs=1 conv=notrunc seek={}" | sh


It will narrow the menubar icon down so much that it will become invisible. Ctrl+'mouse drag' the icon to the left most place.

Explanation:
strings finds the position of the icon in the asset container, echo and bc move a few bytes forward to get to the position that is responsible for the width of the icon. printf and dd set that byte to 1 for minimum width.