No offence intended but I think approach breaches the rule that tantra is a matter of guru and practitioner. One may even consider this approach to be a transgression if undertaken by those who practice tantra.
Hi. Yes, often it is restricted to Guru and Disciples who are Vajra Brothers and Sisters who shared the same empowerment and can therefore discuss it.
Equally, some questions may well be very basic, for example explaining the different levels of Tantra.
If a question relates to a practice for which the questioner has received an empowerment, it depends on what it is. The answer may be to refer them back to their root guru, or to online resources which may be used in support, such as the Berzin Archives.
However, this need not always be so. For example the question may relate to a Kalachakra empowerment given by HHDL. It may well be that, if they give details of where and when they received it, we can find another person who attended the same empowerment and is thus able to verify this and then discuss it. The idea of doing so by PM is to ensure that nobody else can read the conversation.
This has recently been the case for me in advising someone online who had received an empowerment from a specific guru at the same time as myself. I assure you that there are secure ways of establishing this, especially with Highest Yoga Tantra, where samaya and vows must be respected.
There are no guarantees here, and it is a new venture, but I think this is certainly much better than dealing with such issues in an open forum, where Mods may need act to protect people from potentially harmful actions or 'transgressions' as you put it.
Hope that reassures you.