Aside from the other great points that have been made already in other top comments, I have a little nitpick (or feedback for the author, if they're a reader): charts should have axis labels, units, and ticks. Otherwise you might as well not have them.
Take the second chart on the page for example, as soon as I saw it a little warning light turned on in my mind. That chart says incremental spend (y axis) vs time (x axis), but no values or ticks on either axis. A chart like this could literally mean _anything_ because you have no idea of the rate at which those lines are getting smaller. You have no idea how much more revenue to startups there is compared to incumbents, the difference that _looks_ big in the chart could even be 0.001%, just "zoomed in".
Take the second chart on the page for example, as soon as I saw it a little warning light turned on in my mind. That chart says incremental spend (y axis) vs time (x axis), but no values or ticks on either axis. A chart like this could literally mean _anything_ because you have no idea of the rate at which those lines are getting smaller. You have no idea how much more revenue to startups there is compared to incumbents, the difference that _looks_ big in the chart could even be 0.001%, just "zoomed in".