A Dominus cannot prove he is worthy of that much trust before the work has been done. Anyone offering that proof in advance is offering theatre. What he can do is demonstrate worthiness across time, through consistency, accurate perception, and the discipline to govern himself as rigorously as he governs the slave. The demonstration is the only proof that counts.
Maledom, as it now exists in virtual worlds, is not dominance. It is the aesthetic of dominance performed for an audience that cannot tell the difference. The men who populate these spaces could not hold authority in a real dynamic. The women who populate them are not slaves but tourists, drawn by a badly written novel and the imagery it sold them. Each rewards the other's incapacity. To frequent these places is to endorse the parody that makes serious dynamics harder to recognise and harder to find.
Crossing a boundary and violating one are not the same act. Crossing happens inside a frame that is genuinely trying to find its edges. Violation happens when care was absent, when the limit was known and disregarded, or when the Dominus's response to having crossed it reveals entitlement rather than error. The difference is not always visible in the moment. It is visible in what surrounds it.