Earlier quoted context omitted.
It not an exit. But by default someone has to knowingly run the Snowflake applet but webmasters could modify the code to automatically essentially start a Tor guard in someones browser. Though, that would be very evil to abuse someones resources like that. That example has the users consent before starting.
That's already how many shady VPN software work. Remember if a VPN is "free", you are the product. Web scraping companies pay $$$$ for residential and mobile IPs.
Yes, but running a Snowflake doesn't expose your IP to the website being visited, and therefore you're safe from abuse complaints/prosecution, unlike the people who run the exit nodes.