If Bambu were out there suing people for stuff they didn’t make, I’d be more in line with calling them thieves. But the work they have used is still freely available to anyone who wants to use it. Similar to how Sovol sells what is essentially a preassembled Voron; I’m an engineer, I wouldn’t buy one because I’d rather do it myself. But to the hundreds of thousands of people who wouldn’t want to spend a week building a printer, but love the design and concept of the Voron, they now have the option. Everyone with their Voron can continue using it, and everyone who wants to just buy one can.
I mean, look at the computer industry/ hobby. Started off with a bunch of enthusiats building crap in their garage. Computers became important, businesses started taking note, and now when the average person thinks of a home computer, they think “Dell, HP, Apple”. But all the other stuff didn’t just go away. There’s still a huge, thriving community of people who slapped their stuff together and run the jankiest, least proprietary OS possible on them. Nothing’s stopping them from doing what they want to do, but now everyone else can do it, too.
I think it all depends on the sincerity and scale of the compliment. If someone just offhandedly says that your shoes are cool, it’s ok to just say thanks and move on. But if someone makes a specific compliment on something close to you, like pointing out a part of your project they like, it might be more appropriate to talk about choices you made, how it was done etc.