There's still not a lot of evidence for the narrative that he was supressed by some nefarious forces that others weren't subject to.
In a nutshell, he was an inventor who failed in his goal to create some sort of world changing invention which would make him rich like some of his peers eg Edison and Marconi.
AC lost a format war to DC and he ended up selling the patent, making him independently rich enough to pursue being an inventor full time. He then spent his entire life doing all sorts of amazing science and experimentation, which he was allowed to do because America... however he never really came up with anything that had commercial applications during his lifetime. Radio control was considered a novelty, wireless charging only took off relatively recently, and we still don't have wireless electricity beaming across the Atlantic. That's the reason people are still toying with his ideas, because many of them were decades or even centuries ahead of his time.
His accomplishments were recognised at the time as well, he communicated with lots of educational establishments and they all agreed he was an absolute genius. I think the nature of his independence is one of the reasons his legacy wasn't celebrated as much it could have been. Compared to scientists did their work within a university, he had nobody to promote his legacy after his death.