Good to know, do you want to mention which you tried and did not work ? Then we have a kind of negative list of such providers, which can also be meaningful, where not to look at (again).
Your argument or conclusion could be true of course, but somehow it could be also possible especially in the large liquid Forex market that one is providing good signals here. Just as a kind of insurance of having a (limited) bad time for their own trading when they get some extra cash from their paid service. That could be also kind of reason that there are so many hired bankers which also could trade only for themselves. I mean if they are really profitable why the need to work in a bank and trade for the bank only ?
They could compound theirselves and over time get much more money from their own trading than getting those bonuses in the bank. Because you have a certain limit every year, it does not increase to no limits, there is always a limit per trader per year which is the max loss they can have. So own compound on own personal accounts and trading only for your own is best option. But it is also a true that there are many traders in the banks who also really want to trade for the bank only (as a kind of insurance I guess, here too). Because they recieve a fixed salary too and in case they produce a large loss they can only loose their job and not their own money. Otherwise there is no serious reason to get only up to 20% of profits in a bank, when you could get 100% of profits when trading for yourself only. So the only possible explanation here they want a kind of insurance for themselves.
Same is for the hedge fund industry. If you have a really good consistent strategy why do you need someone else his money to trade with ? You could easily get to your own trading limits yourself just by trading your own high sharpe strategy. So no one rather in the fund industry or in a bank or simply any hired trader makes sense. Just trade for your own personal accounts, that's it. And if you want an insurance as sole trader you only need to pull out some profits from the trading accounts into a longer term 'investing' account from time to time for example.
The same argument of insurance could be for signal providers here too. Especially in Forex world, where is that huge liquidity there. So I find it legit to ask here.