Sure, there are laws against overinflating an appraisal...it is called frauding the lender.
in these cases you could ONLY have an appraisal from one of the banks approved appraisers.
those appraisers were on the list because they gave favorable appraisals to the BANKS SPECIFICATIONS.
If you did not obey the bank you were not on the list.
If you did not use the list, you loan was rejected.