I have read a lot of questions mainly this one : Custom Field Limits For Managed Packages) posted here but still not able to find a clear answer.
I have a 'security verified' app exchange package that I installed on my dev org, and if I go to the installed package , I see the 'Count towards limits' checkbox checked. The same is the case with a non app exchange not security reviewed package version that I installed on another developer org. That also has the 'Count towards Limits' checkbox checked.
There isnt a way for me to test this on Prod environments and other salesforce editions, and I cannot find much documentation on this.
I did find this question : https://help.salesforce.com/articleView?id=faq_distribution_installing_why_do_the_custom.htm&type=0
and from it, I can infer that custom fields, no matter an app exchange package or a regular managed package WILL count towards the limit. The same seems to be case from my developer org tests, but just want to make sure, and confirm from any other documentations as well.
I am only talking about custom fields, my package does not contain any tabs / custom objects etc. Only custom fields on standard objects and a connected app.