Use of closed models is unprofessional, and depending on your field negligent. The fact that it has been widely normalized does not make it less so.
You're handing over your (presumably your customer/employers) data to an unaccountable third party which has demonstrated itself willing to commit criminal acts, and to take other people's data without permission. Your ability to continue to perform this work can be withdrawn at any time for any (or no) reason. You have little ability to validate that the work is being performed as expected and isn't being silently nerfed or outright subverted based on competitive considerations, bribes, overactive 'safety', or cost management.
Outsourcing to a black box would be a reasonable expectation if you asked a non-professional to perform the work. A professional should be able to account for the tools they use.
You're handing over your (presumably your customer/employers) data to an unaccountable third party which has demonstrated itself willing to commit criminal acts, and to take other people's data without permission. Your ability to continue to perform this work can be withdrawn at any time for any (or no) reason. You have little ability to validate that the work is being performed as expected and isn't being silently nerfed or outright subverted based on competitive considerations, bribes, overactive 'safety', or cost management.
Outsourcing to a black box would be a reasonable expectation if you asked a non-professional to perform the work. A professional should be able to account for the tools they use.