You absolutely can write about it on the forum.
As an example of such a thread, here’s one I contributed to back in March…
Generally, the only reason I’ve seen such threads moderated is because the people making the complaints did one of two things…
- Named a specific player
- Insulted Blizzard
As you can see from the thread I linked, it’s entirely possible to level criticisms against the company complaining about their lack of EULA enforcement for this sort of thing if you do so without resorting to insults or naming individuals that are the reason for making such complaints.
However, as you’ll also note, that thread’s from March, and it was made / contributed to, from people that had gotten fed up with no action having been taken for months against clear and serious EULA infractions that should have resulted in account closures, i.e. this is something that Blizzard hasn’t been addressing properly for at least half a year, probably longer, so don’t hold your breath hoping that they’ll have a sudden change of heart and actually start enforcement.