Its a so general question, that has a million answers.
Everything can go wrong, from the strategy if its a martingale or a grid etc., from the market and global environment (think coronavirus) and of course the technical stuff, signal copying, different brokers, slippage.
But you shouldn't get discouraged, there is always the possibility to find something worth looking into.
Discussion and recommendations about signals is not allowed in the forum, so you have to make your own search and decide if there is a (or some) signal(s) worth subscribing.

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Hi, every1
I have some questions about signals, I would like to know if this is a good business
What aspect could go wrong?
1. slippage?
2. changing of the market?
3....? what else...?
30 usd monthly worth it?
Thanks a lot!