I agree with you that the chosen line plots are most suitable for this case. However, those plots are too overcrowded with too much lines (more than the optimum of 4-5 lines) so it’s hard to make people focus on what they want to illustrate. In my opinion, it would be much nicer if they just select plots from the top ten list and discard the rest.
Also, the colour scheme used is too vibrant and lack of carefulness in chosen colour theme. They are not blended and those combinations are just not go well together.