When I use the platform's messaging system I follow some simple rules. In particular, it is forbidden to communicate these informations:
Phone number
Email address
Full Name
Mailing address
An evocation to another means of payment other than the online booking
Aggressive, threatening or insulting language
A link to another website
I do not forget the classic rules of courtesy when communicating with other members.
If I try to go off the site, I risk permanent exclusion from the site.