CartoonAnime told me about this weird message she found whole looking through the community server thing..
When I checked the account I noticed there's absolutely 0 activity, I can't tell if it's a bot or just a random weirdo but either way beware in case it starts commenting under people's submissions like the other bots on this site 😭
I'd advise you to report them but it'll be just fine blocking them

https://medibang.com/author/26187832/activities/