Workers are apparently being offered shares of AMBO instead of real money.
"Operating expenses for the second quarter of 2023 decreased by 47.4% to $2.0 million from $3.8 million for the same period of 2022. The decrease was primarily due to the Company’s issuance of 5.2 million shares of fully vested restricted stock units to senior management and key employees as compensation during the second quarter of 2022, and stringent expense controls to improve operating efficiency."
https://www.sec.gov/Archives/edgar/data/1494558/000110465923121638/ambo-20230630xex99d1.htm