Hm, are you just violating their TOS and they're putting the onus on WSJ to ask them to take down your link:
I use it often on news websites as it allows you to by-pass most soft paywalls.
I learned of its existence through other users pasting similar links with articles that involve paywalls.
Previous instances of posting outline links to get around client-side only paywalls have not been fussed at, so I interpreted that to mean acceptance of the practice.
Someone educate me?
Are paywalls ok?
It's ok to post stories from sites with paywalls that have workarounds.
In comments, it's ok to ask how to read an article and to help other users do so. But please don't post complaints about paywalls. Those are off topic.
https://news.ycombinator.com/newsfaq.html
Obviously, outline.com wouldn't work unless WSJ explicitly allows them to bypass its paywall. (I have no idea why WSJ does this.) If it's OK with WSJ, I don't see why people should have ethical problems with it.