Yes, if you have a slow internet connection and no budget for games. But you must be technically savvy enough to avoid malware.
Repacks. I can name Fitgirl, DODI and Masquerade on the top of my head. Crash-free? That depends on the game. r/CrackSupport Bus Simulator 18 - FAQ
If you still choose to search for on torrent sites or forums, always use a VPN, scan every file, and remember that the developers worked hard to bring you the open-world bus experience.
: To achieve extreme compression, some files (like high-quality textures or audio) might be stripped or corrupted, leading to crashes. Bus Simulator 18 - FAQ