In a sense, by proxy of also wanting THEM to know, people, and especially fans of them WILL know who they are/currently are in. Not saying it's the same for every single CC out there, but unless they make it to a point of completely nuking who they were, to the point of not even leaving traces, is very hard to tell otherwise, if most likely they wouldn't be hired on another agency/corpo or went somewhere where the grass is greener a.k.a. with pretty guaranteed success, and in this case, Hololive, which at least for like 99% of people, unless you are too weary or won't bother with japanese corpos, an easy way to a stable position, money, and if you really like it, set for life, more or less.