Someone's Hiding the Numbers
A chart with no Y-axis labels is not a chart. It's a vibe.
Whoever made this didn't want you doing math. They wanted you to feel a trend, not measure one.
This is how propaganda works when it's wearing a blazer.
A conveniently unlabeled Y-axis is the oldest trick in the data manipulation playbook, and someone really doesn't want you knowing the actual scale.
Source
x.com