yes, before when I was still studying crypto and I still knew little about it, I would pay for a signal just to double my capital and what I paid for was a coach who would teach me strategy in crypto
then did you able to make double? signal is worthless i think, if paid signals working and everyone can profit easily then no one lose here.
i did not believe it from the beginning of my trading, i heard some people profit here but end of the day they leave from with big loses.
Though what you paid for was something different because it was for getting trained, I wouldn't recommend gurus and coaches as well because not all of them are worth being paid for what they teach you as they don't know much themselves unless it is someone who has a lot of knowledge and experience but I doubt that a person who has a lot of knowledge and experience about the market will have time to teach people about trading instead of trading themselves because trading can provide a person with greater profits.
So, the best thing is to try and avoid all these paid services and learn everything yourself. There are thousands of free resources available online that one can use to learn about cryptocurrencies, the market, trading techniques, indicators, candlesticks, and every other thing that might be required.