You give a warning and second chance to workers who have been loyal and industrious. Meta is to blame for making these meal vouchers open to abuse, and not monitoring them for years. Or forever? Meta tempted good workers to steal.
Blame workers and blame Meta.
The most I ever made in my working life (retired in 2013)was a little less than $3k a month & no per diem unless I was out of town attending classes. Not sure if that money was included in my taxable income or not.