If we want more people to move to Proton, a calendar without the ability to color code events inevitably will turn people away from even giving it a real try and eventually moving fully to a paid account. If Proton insists on paywalling such an integral feature, at least give free users a handful of color options; then if you want to paywall the color picker, at least you’re not turning away potential users with calendars that appear to lack even something as basic as color customization.