Thing is, there is little point closing/moving threads, but allowing farmed accounts. They gotta post somewhere.
Locking threads in the beginner and help is ok, but these accounts are still lurking.

Take https://bitcointalk.org/index.php?action=profile;u=836341 emezh10.
If you look in beginner and help now, emezh10 is the most recent poster in 5 6 threads in a row. You can see that took him 6 minutes.

Look at his post history, bingo. Spam. Farmed account.
Those 5 posts in beginner and help were only part of 10 posts today. all in beginner and help. All 10 posts took 8 minute.
To call them 1 line spam is being generous. They are only half a line.

It is so clear to see. So easy to find.
Of course, emezh10 has other accounts doing exactly the same thing, I can see them!