Most people have an intuitive sense to ask themselves questions like "If I do this, will someone be harmed, who, how much harm, what kind of harm, etc.", that factors into moral decisions.
Almost everyone, even people without a moral sense, have a self-preservation sense- "How likely is it that I will get caught? If I get caught, will I get punished? How bad will the punishment be?" and these factor into a personal risk decision. Laws, among having other purposes, are a convenient way to inform people ahead of time of the risks, in hopes of deterring undesirable behavior.
But most people aren't sociopaths and while they might make fuzzy moral decisions about low-harm low-risk activities, they will shy away from high-harm or high-risk activities, either out of moral sense or self preservation sense or both.
"Stealing from rich companies" is a just a cope. In the case of an exploit against a large company, real innocent people can be harmed, even severely. Exposing whistleblowers or dissidents has even resulted in death.