Sega are famously far less litigious than most games companies. They know about modders, community servers (for example PSO servers) and even fans who release brand new games using Sega mascots like Sonic. In fact (IIRC) that’s how Sonic Mania began life.
This might be different given it’s a company logo and thus trademark. But I wouldn’t be so sure they’d get a cease and desist like if someone imitated Nintendos logo.
I wonder where's the line between using a font and copyright/trademark infringement.
If the font is proprietary then using that without permission could be copyright infringement.
If the logo can be confused as owned by another entity, then that could be argued as trademark infringement.
But these cases would need to be decided in court. And different jurisdictions might be more restrictive than others.