I love that game too, it brought me closer to a lot of exes that I know now but I have some sort of good news..?
It wasn't actually Sega that took the game down, it's either is a fake account or a well-known person that took it down I forgot the name but it's "game- something..
Sega loves fan games, as long as nobody is making actual money off of it, Sega completely fine with it. + Sega has also acknowledged Sonic.exe before so.. yippee
Also! PCX didn't get copyrighted he's just got removed temporarily, so pillar Chase doesn't get taken down.