WARNING: I do not recommend working with this team of developers.
Upon paying for some minor custom development work, we received note that our custom add-on was released publicly to everyone via the same developers who created our custom solution. This was NOT covered in our original agreements and is nowhere posted by the two individuals who completed this work. When I asked about this, they stated that this was in their original advertised work descriptions, unless we paid for exclusivity earlier on. This was not described in their thread posts or between us (the client) before the work was completed and the deliverable was provided.
After waiting more than a month for responses, it's not worth my exclusivity anymore as the source is now plastered across the internet on various illegal websites. What a waste of private development work.
If you're looking for someone to develop your services who can keep your projects private, I'd recommend steering away from this service.
We were deceived from the developers, and I will never be working with
@Ozzy47 or
@Painbaker again in the future. Stay away from them!

...seems rather unusual.
Would be interesting to know which specific add-on this was.
I think
@Forsaken has done a great job of thoroughly & very reasonably addressing this matter. Case closed.
Just wanted to add that it seems quite odd that anyone would even presume to expect exclusivity without specifically making this expectation absolutely clear right from the get-go.
My opinion is that exclusivity as a standard practice for developers, would simply be utterly absurd. Developers are not discount personal servants-nor cheap slaves. This is a legitimate job for them, although likely only a part-time/or second-possibly even third side job—which I can't imagine is all that profitable in general and as I currently understand things, the work itself is anywhere between bloody complicated through to outright nightmarish complexity.
So in light of failing to directly clarify one's exclusivity expectation to begin with, thusly means therefore I do not see any logically reasoned justification for such an expectation whatsoever.
Quite frankly based on the highly reactive response, it suggests possibly more than merely being an erroneous expectation and perhaps instead a false sense of entitlement. Now with all due respect, it just seems a completely ridiculous and entirely unreasonable subjective expectation to have for a meagre $40 custom job—which is roughly around an average mid-range add-on purchase price.

...oh, but then things get sillier subsequent to the OP quoted above, as then the $40 was fully refunded, so the developers actually have taken reasonable steps to resolve the rather onesided non-issue.
They did the work...yet they have had to surrender this $40 chump change donation simply to help resolve a subjective error which is not of their fault at all.
Honestly I think the shameless lack of reasonability or even a basic degree of gratitude for the full refund, is quite telling.
@Painbaker &
@Ozzy47 have each helped me with numerous odd support jobs and of course these were done free of charge because I'd already purchased the products—and still, when I am able to, I make sure to show my appreciation for their help, via donating some extra cash.
I consider them both to be very reliable and indeed capable developers who of course I will also happily recommend to others.
Ultimately, this whole entitlement expectation thing is nonsense and developers deserve much more respect than the OP has failed to demonstrate here.