Salt the hash with something unique to that specific user so identical passwords have different hashes
Isn’t that… the very definition of a Salt? A user-specific known string? Though my understanding is that the salt gets appended to the user-provided password, hashed and then checked against the record, so I wouldn’t say that the hash is salted, but rather the password.
Also using a pepper is good practice in addition to a salt, though the latter is more important.
At this point, Prime doesn’t make sense if you want to save on shipping. It made sense because it included a lot of good stuff (video before ads, some music, shipping, games) but just for shipping, there were better options.
I basically overpaid but didn’t care out of convenience - partner sometimes watched prime, I ordered occasionally, played some included games. But the changes to video were so shady that I cancelled it.