I do not have any experience with cryptohopper.com but I consider that bots are not so profitable as they are advertised. As far as I know robots handle arbitrage well enough but any other market strategies are usually failing. You may try to get your own experience to figure out this situation but I am completely sure that nobody will sell super profitable robots because they would earn themselves instead.
So far, the platform reached 200k subscribers and hundreds of long term users. Basically they do not hold your funds as it needs to be spent from your exchange through the use of API keys. Profits or losses really depends on the market movement and how you configure your hopper.
Hope this helps!