[CQ-Contest] Changing categories

[Yuri VE3DZ]

Worked one well-known contester today, who was part of the DX multi-op team
in the last weekend's contest. When I asked what category they were in he
refused to answer saying that they won't reveal it until after LOG's
submission deadline, so the competitors "won't have a chance to adjust and
change their categories".

Is this something new? I know some people NEVER post their scores on 3830...
Should we all who attempt to make top ten NOT do this?

Thanks.

73 Yuri  VE3DZ