why did they get hacked? was it a weak password or malware infection like key logger?
i think only one or two wallet(s) is enough. one offline as cold storage and one online as a hot wallet. then there is no way they get hacked!
Im instal not trusted app, bitcoinhacker, bitcoin genetor etc.
Im use same password for my blockchain wallet and email. that's why hacker can aces my wallet.
Yeah I think two wallet are enough, one paper wallet and one online wallet, too many wallets is hard to manage.
The only thing make your bitcoin wallet get hacked is your weak security, using paper wallet sure will hard to hacked and for online wallet use 2fa are the best way to avoid hacker touch your wallet.
for online wallet, i suggest you to use 3rd part like coinbase or Xapo.