You correct. Many of these so called signals are either biased or outright reckless. You see buy signals with the Stoploss set below liquidation and you wonder if these people are bent on making people get rekt.

There are however some good signals and I know a few free ones. I personally judge good signals by

1. Risk management or R:R ratio
2. Success rate.

Like I said, there are free ones you don't even have to pay for. Good calls, healthy Stoploss - -2%.

Some signal groups also offer educative info to their subscribers so that they not only signals but also understand how to trade.

I can leave a link but that's only if you're interested. And very importantly, Always DYOR.