[Taek]

Some of this can be addressed by never giving sensitive data to remote servers. This wouldn't work for credit cards, but with Bitcoin you never need to let a non-bitcoin library touch your private key, because that's not going over https.

Similarly, if you encrypt all of your information from within a safe library before handing it out to unsafe libraries, they can't leak anything. This can add overhead and redundant encryption (and you still need to trust that the remote server processing your data is safe), but there are steps you can take to be more safe.