Everything is possible especially if they will think lots of ways to attack on bitcoin. But, as far as I know, bitcoin didn't experience being hacked yet since they have made very strong security. But, I think can steal our assets in various ways maybe a form of fraud that is similar to Bitcoin wallet address so that they can steal the assets of anyone. But, bitcoin lasted a decade and look at how bitcoin always improve and increase it's price. For sure lots have tried on making out some exploit in terms of security but they failed to do so because of it's very strong security system. So I could say bitcoin network is more secure compare to those altcoin network.