there is no safe way to grow your bitcoin, because they all have risks.
but you stay focused on the signature campaign, if you want to be safe without risk.
Hmmm Noted! Thanks! Will not touch those dice/casino sites as well as those ponzi scams!!
A good rule of thumb is to search this forum (and other forums using google) BEFORE you invest anything. Most good-looking sites still have a reasonable chance of being unprofitable.
For example: i tried investing some satoshis in btcjam, ended up losing intrest instead of gaining it, because the site was infested with loan defaulters. If i had done my homework, i would have avoided losing coins.