Not zero indexing is misleading if you are comparing discrete things like GPU performance, not in the case of plotting a timeline graph. Their published stats could be seen as misleading if they only displayed a short and/or a specific timeline (excluding the latest data for example).
Hint: This has nothing to do with a zero y-axis, why would one need to have a zero value to have the y-axis start at zero?
The reason to have a non-zero y-axis for time series is to amplify changes, e.g. the changes might be to small to see with a zeroed y-axis. Or you have ups and downs and want to compare them, with a zeroed y-axis again the changes might be too small to compare.
Whenever you want to show growth, a non-zero y-axis is usually a sign that the aim is to overstate growth, because we as humans estimate growth by the steepness of the graph, not by the numbers. A non-zero y-axis creates a much steeper graph and thus growth is perceived much higher than it is.
2.) Switching to "All Data" also doesn't set the y-axis to zero, but to 6,840.
Having an y-axis set not to zero is in the majority a sign of people who want to inflate growth.