His animosity with Edison was later in life primarily, but seeded with Edison publicly smearing and attacking AC because Edison had such a large financial stake and ego in DC.

Edison eventually lost even autonomy over his previous work to investors and a board of what would become GE.

Tesla had a bit more of an ongoing rivalry with Marconi even as a young man that continued for much of his career.

Westinghouse, bought much of Tesla's portfolio on the cheap- about the equivalent of a million dollars in today's money. While it was a ripoff compared to its actual worth, Westinghouse recognized and didn't interfere with letting Tesla invent or conduct his experimentation as he saw fit.

Tesla very much saw his work as an altruistic calling that was for the advancement and betterment of mankind. Not a shrewd businessman, and thought very little about money outside of needing funding to continue doing his work.