I purchase and use several extensions on an annual subscription basis (and whenever the Extension provider has an unlimited use option - I usually go for that).
Many extension providers have a Download ID, API Key or Subscription Key which is for upgrades and ongoing updates.
I usually build a boilerplate (i.e. a site with the extensions installed and configured), then clone those boilerplates to generate 'Quick Start' Joomla! sites.
I use these boilerplates for my own clients (i.e. site owners whom I design and develop for), and I also share these boilerplates with other Joomlaists in my user group.
I'd like the people who receive and use those boilerplates to get ongoing updates as well, and I keep my subscriptions paid up.
Do I have to remove the Download IDs and Subscription Keys before distributing my Joomla! sites?