Regarding the Adalah of marriage witnesses: Does sharing Instagram videos with music or uncovered women void one's validity? If persisting in minor sins makes a person a fasiq, wouldn't almost everyone lose their Adalah today? How is this condition applied in our times?

Ustadh AbdulAziz al-Haqqan
The condition is outward uprightness. The witness should be a Muslim who prays and is not known for open sins.