This is a danger that any independent resource carries, so there really is a certain specificity that requires detailed study and consideration. Because it behaves a little differently than other standard assets. For example, currency pairs. I understand your emotions and it seems to me that every trader who has faced losses at least once understands you.
But I just want to say that you should not lose confidence in this business, because there are actually great prospects here, you just should not be disappointed and maybe you should take a little rest before you start a new stage of work, most likely with others assets and other strategies. But I'm sure everything will be okay.

I would also like an answer to this question, because there are very, very many sites like this now. But I really don't understand how to determine which service is really the right one and what I should avoid under any circumstances. Of course I understand all that you have described in theory, I read about it before, but it is no secret that as a rule all details are tested in practice and considering bitcoin's value today I would not like to risk and invest my money in some doubtful decision.
If you do have more detailed information about it, please share, because it is a really big and complicated decision and we need some guidelines.