Then it should be phrased like that. It's obvious the original comment was phrased as a condescending question, especially since they tried to answer it themselves.
There's a difference between genuine interest and trying to show off how smart you are.
Oh, I think everyone was confused because there was no serious technical critique. You made a flippant comment about disk space and network latency. Basic observations that anyone building this would have considered.
You can see from all the comments that everyone viewed you as condescending and unhelpful. You might want to revisit your writing style, since your intentions are not clear to anyone.
you are an unpleasant person to talk with
I'm glad you picked up on my tone. I'd suggest not writing pointless criticism.
Them: "Hey, we wanted to build an API!" You: "What if you don't build an API, and just download a file? That's the same right?"
You must be a joy to peer review at work.