Edited to add info about Blacklisting & reporting through the website to the first post.
Converse with fellow players
@kdurmeter If you think an SA is breaking the tos, Block the SA and it will prompt you to tell the reason why (It works as the report for that specific SA).
If the players is posting them constantly and other things that harm others around them, report player AND block the SA (Double whamy.)
And if the player really doesn't stop, report their xbox account. (Worst case, the account gets deleted with everything they have earned on it. Best case they just get a ban from playing anything online for a while.)
This has basically been my approach.
@kdurmeter I got an e-mail back from a support ticket and they've said things will be investigated and it helps them a lot to have the Symbol Arts ID. So I guess if you do report through the website try to capture the Symbol Arts ID as well.
I'm not really sure. I haven't seen any in-game mods. Reporting through the site just mean they send you an automated e-mail, so I dunno how much better that is. Though they do indicate you can respond to the e-mail with more details, they never responded to mine.