It's not a trap, it's just convenient to use. I can export my data in a CSV format that can be imported in another password manager if I choose to do so in the future.
> We believe security shouldn't be proprietary. 1Password only uses standard, documented data formats and encryption methods, so you can import and export your most important information at any time.
It's pretty standard to not be able to audit a company, and most of us do business with all of those companies anyways.
It's pretty obvious when UPS mishandles your packages, it's either missing, damaged, visibly opened (e.g. security tape broken). It's likely very rare that they would 'mishandle' a package in such a way that you would not be able to notice. Companies like 1password can (and likely do) use your information in ways that are impossible for you to detect, so this analogy does not apply.
> how my dentist handles my records
In the US, you have HIPAA, and there are big penalties for mishandling medical records. The same does not exist for businesses like 1password, so this analogy does not apply.
> how Papa Johns handles the ingredients that make my pizza,
There are sanitation and food handling laws (in the US), and food service companies can get shut down for mishandling food. The same does not exist for businesses like 1password, so this analogy does not apply.
Edit: Since HN's commenting system arbitrarily limits the depth of comments:
My point is that your analogies are not similar. In your analogies, there are legal penalties for violation, whereas in the case of 1password, there are 0 legal penalties and very likely 0 financial penalties for malicious behavior when it comes to your information. In case you still don't believe me, see: Equifax. We can all trust their CEO now, right? (wrong)
Yes, there are regulations and consequences for mishandling food and patient data but I still have no personal way to ensure that these practices are followed. In the end, you have to trust the entity that you are doing business with. The same applies to 1Password.
Which is not to say that FOSS can't be secure, but getting back to my original point, since either way I have to trust experts, I might as well pick the product that wins on functionality and polish.