To keep our btcsecure even a big or small amount we must always consider that we cant trust any sites or apps that much , this apps were all controlled by a developer though there are still some that is really trusted. Try to portion it on diffrent wallets or why not consider investing on different andreliables investment sites its like storing too jut dont put all in one investment.
No man, I would never invest my big amount of bitcoins even in different sites because its fine if its 1-2 bitcoins but suppose for those who have like 100 - 200 bitcoins would they or even us be able to digest a loss of around 10-20 bitcoins in a scenario a site scams.I think using online wallets for storing big amounts means you are risking, better use offline wallets and less often open them.
