As I don’t know who you’re talking about in particular, I have a genuine question. How old is this person? Because I can totally understand why a 16 years old fan would think that way, even a little bit older. I’m not born with internet, I think I had my first computer at 12 and it didn’t have internet before a few years later, and still I don’t pretend I can understand how a 50 years old person use social media. I can see how my mom does, but my mom isn’t famous, so it’s of course not the same.
What I’m 100% sure, is that Gillian (and David) don’t use social media as we do, Gillian even said she doesn’t have the apps on her phone. I think this is a professional decision, probably coming from her PR, to have one name for all her social media, which absolutely makes sense. There’s nothing else to see in this. She had a blast with Chewie, the joke got old, she got too much merch and ended it. Period.
So when everyone in this fandom, young and older, will understand that nor Gillian neither David are Justin Bieber, we will all have made a huge step forward!