Bug bounty programs

Immunefi

https://immunefi.com/bounty/polygon

https://immunefi.com/bounty/polygonzkevm/

Hexens

https://r.xyz/program/f86864f2-8e7b-443a-84fe-cc0925f06221

HackenProof

https://hackenproof.com/polygon-technology/polygon-pos

HackerOne

https://hackerone.com/polygon-technology