Ya it really smart to allow some randoms you don't know accuses to your battle coms an sensitive information an hope they aren't leaking intel, Lol merc guilds in this game will be as much of a meme as they are in Eve online. I.E no one will use them an they'll just be some shitty RP guild acting like they aren't a RP guild while pretending to be good at PVP.
Depends on their reputation in regards to their services and competencies.
During the heyday of Mortal Online (1) people hired
Anquer Quare (AQ) and the various Kranesh mercenary outfits such as
ENVY, Eclipse (EC), etc. to turn the tides of important battles quite regularly, as their presence could easily be a deciding factor due to their overall competence in battle. In a different way, the
Guttersnipes (Guts) were regularly hired for clandestine operations and sieges alike due to their unique way of making one's opponents absolutely miserable.
Here in Mortal Online 2, groups like
CTX could easily fill the same space that AQ/Kranesh mercs did, and
Miscreants are in a good spot to fill the Guts void.