They're not trying to circumvent it, they're trying to find offensive sentences that become funny when they go through the filter. Personally I don't understand what such a thread is doing in the "Forum Help & Feedback" section.Let me be totally clear.
If this thread exists for the sole reason to discover ways to circumvent the filter, account action can be expected to follow.
The profanity filter is an OPTIONAL feature for any member that doesn't care to read curse words. If you choose to try to find a way to make them read curse words anyway, you can expect warnings.
Respect the preferences of your fellow members. This isn't censorship, it's customization.