Can rwaltz.coom be considered as SEO spam. I tried to report these topics but they are deleted on the basis of topics, not account. For example, @cyrilmorris[1] created 36 posts, all of which contain a rwaltz.coom link.
The same thing with Bitget[2], which now has a signature campaign, but in the past there were a lot of accounts that created topics for nothing but promoting this service.
I checked post history and found out user @cyrilmorris mention link rwaltz[dot]com/services/crypto-exchange-development on many posts on slightly different thread/reply. I just reported this user. Meanwhile other user is rather vague case.
If it will not be deleted from the posts with quotes we have another one problem: if someone will help a spammer with quotation it could stay. Don't quote spammers!
Unfortunately, creating a post that counts for a signature payment is more important to many members. They're literally helping spammers this way. What they should have done, is Report the post.
Well, it took a little more time for these posts with spam quoting to be deleted, but they are deleted as well. Great! So we can report them too.
But unfortunately, and you are right in this, catching SEO spam in quotes is harder, because it can be in several posts from the original spam. So even if it would be deleted by report, it can be missed because links in quotes are not as visible.

User who quote post which contain SEO spam also could be reported, especially if their reply isn't constructive or helpful. I did that few times and most of them marked as good.