The common theme seems to be "don't do it." This is a little disappointing because I want to contribute somehow.
I’d say: "do it, but be aware of the likely range of outcomes”:
* home relays may attract police attendance in certain jurisdictions
* small devices may not be able to transfer traffic at 100Mbps
Would you guys suggest running a bridge/relay instead, or just not helping out in terms of bandwidth contribution?
If your greatest concern is the police, run a bridge or non-exit relay; or run it out of a data centre; or explain Tor to them in advance.
If your greatest concern is saturating your link, try it with the device you have, then upgrade if necessary.
If neither is a concern, go for it!
Tim