It is not fine. Just like burglars looking at a house is not fine (still nothing to do with being legal or not). Intent defines if something is OK or not. Just like killing is always illegal but when you do it to save someone else it is hmm less bad, you see intent...
What are the intents of people doing scan? I don't see any legitimate reason for scanning random people computers or servers that are not yours.
What are the intents of people doing scan? I don't see any legitimate reason for scanning random people computers or servers that are not yours.