How does one differentiate between aTriz (personal projects) and other projects (dunno what to call them; since there are no ALU projects).

You can't, the same way you can't know whether the user (any other bounty manager) who posts the thread is actually managing it or whether he/she/it/they delegated it to someone for $50 per week. Not that others matter in a witch hunt, obviously.

BTW since we don't have any ALU project; what is ALU...
You should ask god to enlighten you; not that the definition of that is of any concern to you.