Ghosting has been common in RolePlaying communities for years, it just feels like more when there are more waves of people joining. I would just recommend being more selective in partners.
Hey there. I'm very familiar with DCAU. Mostly with Batman/Superman/Justice League & Justice League Unlimited /Batman Beyond. I also used to love Legion of Superheros.
I'm looking for a double up RP. If this works for you feel free to send me a DM whenever.
Good luck finding a partner! I've only seen Mobile Fighter G Gundam but I've seen some other gundam RPers on here. I'm sure it's only a matter of time before some message you.