You have a nice argument but I think the forum doesn't work like that. Countless threads have been created and abandoned by their various OPs in the past and have not been locked till now whether they are good or bad. That's how you should view this too.
It could be because there are so many threads that have become redundant and need to be locked that the mods cannot keep up with them all, rather than it is a norm to allow threads even though the discussion has run out and turned to a spam mega thread.
I have seen the mods lock up threads that do not have any meaningful discussion anymore and if this has been reported, it should be considered the same.
- Jay -
I quite understand you. Moderators can be locking those threads without meaning but this thread in question is not without meaning, only that the company/user behind the creation is such of a questionable character. We have enough of questionable characters in the forum and are still very active without any issues. Such threads if not replied to by anyone would be as though locked as well which could have served the same purpose, but for some reason, people continue to write in them. I think they should not be disenfranchised.
Also, the questionable character doesn't mean they can't still come back for a good purpose and engage the forum better than before.
The only thing I see is that it could be a means that continues to indirectly build traffic and advertise for the ignoble company which I believe the OP here frowns at and which I share a valid view with him as well. But I still believe that looking away is the best answer here since the OP of that 1xBit thread has not violated the rules of the forum with the thread.
Needless to say, an active thread shouldn't just be closed abruptly.