It will be as useless in terms of enforcement as "shall be used for good, not evil." https://www.json.org/license.html
This software shall not be used for evil. With the exception of IBM, who, together with their partners and minions, are allowed to use this software for evil.
I think they're suggesting a license that says "except Apple, Amazon, Google, Huawei, ..." not a license that literally says "no jerks".
The problem of attempting to enumerate the jerks does seem pretty... insurmountable... to me though.