I agree with you that is not correct to compare absolute patient numbers per country. Each country has a different population size, and each country has a different approach to how they measure infected patients.I agree that you can't use an apples to apples, but this is as best as we have. We certainly shouldn't be using a chart as was posted in the OP! If the narrative being pushed (by the OP) is that the US is "winning the case count war" then that's horseshit. And it needs to be called out as horseshit.
On the other hand: I like this chart a lot from the perspective of the trajectory: the rate of change in each country since the onset in that country. The diagonal dotted lines are very helpful to see things in perspective. And, for the countries who are further ahead in time (China, Korea), you can see when the spread starts to level off.
So I don't call this chart BS, but you do need to be aware what you can, and what you cannot, conclude from it.