Usually free means that it is nothing more than recycled methods to keep yourself private and is usually common knowledge of what tactics hackers and the like try to get you to slip up so they can steal whatever they are targeting for.
Define "common knowledge". I bet 90% of people have no clue about this.
Common knowledge means 10% of the IT experts know about it. Most of the Bitcoin users , and crypto-currency users in general don't.
So it's important if the rest of the community knows this too, especially in this age where privacy invaders and hackers roam freely.
I think the OP should be applauded for giving this away for free.
It's no problem ,I think keeping the Bitcoin network secure is in all of our interests.
So people who host BTC Nodes should really need to educate themselves, but also general BTC users as well.