A: Yes, but you must run the trainer via Proton Tricks or a Windows virtual environment. The trainer reads x86 memory, which Linux native doesn't support.
A: If the lobby is set to "Ranked" or "Public," yes. If it is "Unranked" or "Private," the risk is near zero. Have you used the Black Ops 3 V100.0.0.0 trainer? Share your highest round achieved with god mode in the comments below! Call Of Duty Black Ops 3 V100.0.0.0 Trainer
But what exactly is version V100.0.0.0 ? Why is this specific trainer in such high demand? And—most importantly—how do you use it safely without getting banned or bricking your save file? A: Yes, but you must run the trainer
A: Usually, yes. A single point release often changes memory addresses. Look for a trainer specifically for your exact version number. If it is "Unranked" or "Private," the risk is near zero
However, with great power comes great responsibility. Keep it offline. Respect other players. And always scan your downloads.