You can not mix crypto-exchanges and Forex!
They're very similar actually - both are dealing with currencies, both are fluctuating in relation to each other and both are notoriously volatile. Cryptocurrencies are more hectic than forex markets and less experienced traders are involved, but it's still a relevant comparison.
Can we trust those places as we trust those places in forex charts?
Technical analysis in forex markets tends to be paired with fundamental analysis and used over fairly long timeframes. Often, cryptocurrency traders which use it are doing so based on movements happening over as little as days.
The same metrics can be used for cryptocurrencies as forex markets, but ideally only over several months by people who are experienced in evaluating the many conflicting technical signals, and the state of speculators should be monitored at the same time.