Not paying for something because it's not free is being penny wise, pound foolish.
For a program I use every day, which is well made and has pretty good UX, the price is in line with other utilities I pay for.
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.