Does it matter whether something adheres to OSI's definition if you just want to participate in a sharing economy, but don't like the idea of some large org "abusing" that sharing? Whether something is Open Source is primarily a concern of large organizations and lawyers. If the source is freely available, it is in practice usable and modifiable by any person regardless of what the law says.
You actually meant "in theory" since in practice you will get found out misusing the licensed software sooner or later, if you are exposed to any scrutiny.
Unless your thing isn't used at all, making the point moot.
In practice, people are not exposed to any scrutiny. Tons of people pirate operating systems, image/video editors, CAD software, games, etc. without any issue. It's only large organizations that have that exposure. This is doubly true if you publish the source code to a program you wrote with an "all rights reserved" notice (i.e. you're not really trying to prevent individuals from using your work). If an individual used your program, you'll never know. If a large organization is freeloading off of you, and you learn of it, and you don't like it, then you can go after them. They have no defense because you explicitly told them they may not use it.
