Reporting all time

No. Invalid reports are discarded by the system.

if you spaming that you will report them is punishable. If you just report them without saying it and theres no actual reason they wont get punished :)

No, sending invalid reports will not get you punished. It will, however, diminish the impact/priority of your reports:

Per the IFS FAQ (relevant part highlighted):

WILL MY ACCOUNT GET PUNISHED FOR BEING REPORTED WHEN I DID NOTHING WRONG?

This is unlikely, as reports are only one piece of the puzzle. While they are important to bringing games to our attention the system still gauges the behavior in game before punishments are issued. Also, players who consistently make false reports against others diminishes the value of that player's report and renders them meaningless.

No

thanks for the answers had no ideia how it work btw