Using a chinese clone with the official Saleae software is not ethically a good thing. Saleae has put a lot of effort and resources to develop and support their fine hardware and software, so using a cloned hardware with their software is not fair although it may be possible.
Ethics are an interesting thing. Some would argue that overcharging (beyond recouping development and manufacturing costs) for hardware and getting it made low wage country with little labour protection laws, is also unethical but I don't know whether this is the case or not here.
A more relevant question is whether it's legal to use said software, with a third party hardware? Does the licence agreement contain a clause saying it is only to be used with official Saleae hardware? If not, they clearly don't mind you using it with third party hardware, so there's no ethical question to answer. If there is, then there it clearly is illegal to use the software with a clone.
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Saleae has issues a plea to the community at large to use the clones with software other than theirs. Regardless of the legal aspects, it would be a shame to see a company go under because of people who happily used their efforts without paying for any of it. They make good hard- and software and have been good sports about it until they felt they could no longer continue.
It is all about being reasonable. I'm sure they don't mind a few people using their software, but if it starts weighing on the company, putting it at risk, it seems fair to point people towards very reasonable alternatives.
If you insist on using the software, you might consider making a donation as compensation.
As usual when the issue comes up, I'd like to provide an alternative point of view regarding those "clones": https://www.eevblog.com/forum/beginners/new-oscilloscope/msg1191802/#msg1191802
In essence, those devices "clone" parts of a development kit from Cypress. They're really just breakout boards. Saleae can whine all they want, they knew exactly that they were writing software for a development kit, without any kind of protection in place. It may not be legal that people use their software without purchasing the hardware dongle (which fails being a dongle) but they are partly to blame themselves.
So like I said, when you purchase a $10 FX2LP eval board from China, it only turns into a "Saleae Logic clone" when used with the Saleae Logic software. When used with sigrok, it's not a Saleae Logic, it's a generic FX2LP breakout board that we use with our own firmware. Saleae did not spend any significant effort on hardware or firmware. That has all already been provided by Cypress.
Buy a clone, use it with Sigrok and everyone is happy. Let's not make this more complicated than it has to be.
It would be horrible to pretend that not protecting your software or hardware is asking for it to be used by others. I think many people here would object vehemently to that notion.