I'm hoping that guys that are unwilling to take COVID 19 safety seriously get noted in blacklists. This is vital information for many companions decision whether to see him.

Let's see. To add clarification to this. Someone that refuses to respect the companion's safety requirements related to this.

This would likely also be one that would be discretionary. For some companions it may not be an issue. For others the notation could be seen as beneficial in saving time and conflict for both parties.