It is possible for people who got raided and lost their tc to remove the walls they once set, even though it's officially not their base anymore.
Is it a problem of my config?
https://textuploader.com/1usr9

I think you should play with these settings:

"Use Entity Owners": false, 
"Use Tool Cupboards (Strongly unrecommended)": true,​

Maybe Arrainr will come by and shed light.

Hopefully.
Didn't do Use Tool Cupboards: true
cause it says it's strongly unrecommended. :D

You need to enable both

    "Use Entity Owners": true,
    "Use Tool Cupboards (Strongly unrecommended)": true,​

this way only players that own the building and have TC access are able to remove

I'm curious if you didn't place the item, if you own it.....

because of these 3

    "Use Teams": false,
    "Use Clans": true,
    "Use Friends": false,

Eh, that'd be for person's related to the player, but doesn't answer if the person who made the pre-fab would always be owner of it.

The player who built or placed the entity will always be the owner, and depending on the 3 settings I posted before other players can also remove if they belong in the same team, clan and/or friends list of the owner.

if the double check would both have to be true... Hmm... I think you got it with the both owner true or false would work if tc owner was true. I think what the OP wants is Use ToolCupboards.

Hey there.
Thank you for discussing this.
I do understand logically that Use Tool Cupboards: True should prevent what I mentioned.
I just wonder why it is strongly unrecommended.
There must be something that it does that won't make players happy. :)
I wrote the developer. Maybe he will join and tell us.

Using it on its own as the only check is stongly unrecommended.

So what option should not be missed when using it? Any idea?

Merged post

Ok. The author mentioned that "Strongly unrecommended means that it should only be enabled together with "Use Entity Owners": true.
Thank you for the brainstorming. :)