Really? Its less than the cost of a pint. Not exactly expensive considering the benefits. Sure it could be free, but its not expensive.
The paying part is when you want to sync key-chain between device and require an iCloud subscription which start at $0,99 and bundle other features.
While I would never trust a "free service" (fremium backed with pro account/bundling is still ok AFAIC), it's still hard to consider $4/month for a syncing service cheap. It's literally the price of a cheap VPS service!
PS: From another angle if security is really your priority maybe $4 is not expensive enough. Password manager don't protect you from an hostile OS vendor and on top of that you now have to trust another entity. High levels of security require a global approach and paying more for a Password manager might provide a false sense of security.
1PW has so many more features on top of Apple’s native PW stuff it is only comparable If the basics are needed.