[tor-relays] What's a "useful" relay?

[Rana]

So - what's the metric for calling a middle relay "useful"? Is it the total
number of bytes that it relays daily? 
https://atlas.torproject.org/#details/707A9A3358E0D8653089AF32A097570A96400C
C6 is sending about 0.85 GB every 24 hours. Is it a "useful" relay?
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