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.