I'm not good at graphing data, but isn't the graph exponential while the growth is almost flat or, at best, linear? They mention the graph is yearly but still t

I'm not good at graphing data, but isn't the graph exponential while the growth is almost flat or, at best, linear? They mention the graph is yearly but still their best period was 2017-2018, which is not accurately plotted. I'm not trying to throw mud at DDG's great accomplishments but it does feel a little deceiving if you just look at the graph and go out sharing it with your friends like they're outpacing Google or the search market overall 5-10% yearly growth, which means they are currently at par at most, once their initial boom passed.