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I wonder- if a planet continuously lost atmosphere of the aeons, shouldn't there be a small swirl of gas spiraling out from that planet?

If that is the case, wouldn't it be enough to have a ram-scoop satellite harvesting it?

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I assume you are talking about Mars? It's not in space in isolation. Solar wind has been blasting away the atmosphere for aeons. So it's probably intermingled with solar wind across the trail of the solar system.

It's probably going to tend to collect on the heliopause, but there's a lot of surface area there.

And it's a pretty long ride out.

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