I only recently discovered pinterest as a useful site, but only because a friend convinced me to create an account. It only becomes usable with an account and it even makes fun, but most people are probably like I was and don’t want to create an account and are annoyed of pinterest hijacking the „save image“ function, redirecting you when you don’t have an account and nagging you with a login wall. It really only becomes great if you give in (only took me 5 years or so).