Sorry to ask this, I installed the first 2 iOS 9 Public Betas on my iPad Air 2, but the latest update, I had troubles installing it, so I uninstalled the configuration profile under settings, and tried to search for the update, it gave me the developer beta (beta 5), then I downloaded and installed it, right after installation, It suddenly came up to my mind that developer betas need a fee of $9.99 per month, but I didn't pay for any fees, after the 1 month period, will I experience activation lock?
Wow. Lot of confusion here.
First of all, Activation Lock is basically the requirement to enter AppleID credentials to verify that you are the person who has activated iCloud services on that device. It's meant to prevent the sale and reuse of stolen or unauthorized devices. It has nothing to do with running beta software, per se.
Second, in the past, in order to run developer beta software, Apple required the device to have its UDID registered with a developer site as a device authorized to run the beta software. Apparently, there are plenty of ways around that these days. But regardless, any stipulation or requirement to run developer beta releases of iOS
may require the device's UDID to be registered. To do so requires that you have a $99 (annually) developer account OR work with/for a developer who is willing to register your device. Because of supply/demand, some "developers" are willing to register devices for others, for a profit. Apple condemns this process and will cancel and developer account that it finds doing so. And at iMore, community guidelines prohibit discussion of and sale or solicitation of offers to register UDIDs, so 'nuff said.
With all that said, Activation Lock and the registration of device UDID are two separate things, that have no relationship to each other, beyond the fact that a device that is activation locked cannot be used to run beta software or used in any other way without the proper AppleID credentials. (Also, the "owner" who has the proper credentials can also remove the Find My iPhone feature from a device remotely, making it usable again.)
And AFAIK, neither of these involve a $9.99/month fee.