I maintain a blog where a spammer is posting comments that point to sites on Trello.com
These in turn point to tinyurl sites link to malware, promote porn or illicit downloads.
These are some examples (done as a screenshot image file, so not clickable):

I assume this is taking up space and bandwidth for your systems, as well as increasing the likelihood of getting Trello put on personal or corporate blacklists. I wouldn't like that - I like Trello!