On the topic of accessibility, the contrast of the text in the "up to date" bubbles is very low. I can barely see the yellow one, let alone read it without significant eye strain.

Firefox's dev tools have an Accessibility tab where you can see warnings about low contrast and simulate different forms of color blindness.

It has text supporting the color, so it's fine.

Thanks, fixed now.

Red/green is the most common way to show bad/good, error/success, etc.

Using any other color scheme would just confuse everyone instead of only colorblind people... how would that be any better?