Mbits or Mbytes

I already checked with AI, I was hoping for more human answer.
What's that supposed to mean? What would make my answer more "human"? I've been on this forum longer than LLM's exist.

From my measurement, I can't tell if it is 1024^2 or 1000^2 (as the difference is too small to see for me) but it's bytes, otherwise the graph would be a factor of 8 off.
 
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