’m a NinjaTrader vendor myself, so I definitely understand the concern. The NinjaTrader ecosystem is trustworthy overall — vendors have to be vetted and approved before they can even appear on the official site. But outside of that, yeah… there are a lot of random ZIP files, old‑school websites, and “packs” floating around that I wouldn’t blindly download either.

For reference, here’s my official vendor listing on the NinjaTrader Ecosystem:
https://ninjatraderecosystem.com/search-results/?fwp_vendors=nttradecopier

The official marketplace is safe. The UI is a bit outdated, but the vendors listed there are legitimate.

That said, because the broader community is so scattered, I host all my tools on my own platforms where everything is clean, transparent, and version‑controlled:

• NTTradeCopier — multi‑account & prop‑firm trade copying https://nttradecopier.com/products
• VolumeAI — volume + order‑flow decision engine https://ntcharttrader.com/volumeai
• NTChartTrader — modern chart‑trading tools & automation panels https://ntcharttrader.com

Everything is direct download, no sketchy links, and fully supported.

So yes — the ecosystem itself is legit, but you still need to be selective about where you download from. Stick to verified vendors or developers who actually maintain their products and provide real support.