What’s the incentive to donate to charity? There’s no risk to you because it’s not an exit node.

The difference being that a donation is one-off.

Running a node is continuous.

You can also do recurring donations. Running a Snowflake proxy is basically free if you don't pay for internet traffic so it's a very cheap and low work way to help censored people.

What's the inentive?? Try the ALL NEW TORBUX!! A new ERC20 token with only an 80% pre-mine used to incentivise the participation in the Tor network! Now instead of giving back to a community you derive benefit from, you can pervert the relationship with monetary rewards that benefit an elite class who are planning on disappearing to the Cayman Islands after extracting enough wealth from you and your peers!