Though it is a popular (and biased) notion to say that JP Morgan, the evil banker, pulled the plug on Tesla and stifled his work, the fact of the matter is that Tesla defrauded JP Morgan.
You can' t take money from people on false pretenses and not deliver what you promised to deliver. And that is essentially what Tesla did. He told Morgan he was working on wireless communication, but instead was working on a wireless power transmission moonshot which never panned out and Morgan never agreed to.
I don't care who you are, this would be infuriating. If you pay a guy to build you a new deck but instead he tells you "I thought you could use a new guesthouse along with the deck so I built that and I'm billing you" would you not be shitting bricks?
I'm not saying JP Morgan is the "good guy" here, but I am saying Tesla was more self sabotaged than someone with a conspiracy against him. Morgan legally and rightfully decided not to fund the new and more expensive ideas which Tesla started working on with his money.
His technology for wireless power delivery could be repurposed to wirelessly transmit information. When JP Morgan and Westinghouse (who were also HEAVILY invested in copper) discovered his true motive, they pulled the plug because it greatly threatened their other investments (as well as the established power structure)
His idea was much more costly than normal wireless information transmission. His competitor was making it happen for less, while Tesla was asking for far more money for an overly ambitious and experimental idea.
Westinghouse and Morgan didn't owe Tesla anything for which they'd never agreed to. They didn't write him a blank check.
His competitor... Marconi? They guy who used multiple Tesla patents without attribution to develop his technology?
If it was so simple to do why didn't Tesla do it? He was on contract to do it but didn't. He can complain about patents all he wants, he didn't get the job done.