Many thanks for all your contributions, all this is very interesting.
I own all the knives that are in my signature.
I also bought other knives before that I offered to some of my family members and some others that I threw away.
The knives I threw away were for example Ontario RAT 1 and II copies, they were really cheap, but in no point comparable to the original versions.
I also bought a Y - START JIN02 for $15, that was really appreciated by some youtube members, but I really didn't like it, and I threw it away.
The knives listed in my signature (Kershaw Dividend Composite, Kershaw Dividend Grey, Kershaw Dividend GFN, Böker Plus Mini Tech-Tool City 1, Böker Plus Urban Trapper Cocobolo, Ontario RAT 2 D2 black blade, Ontario RAT 1 D2, Sanrenmu 1161, Ruike P108-SF, Sanrenmu 7073 LUX, Victorinox Sentinel, Victorinox Climber, Real Steel Thor T101 Special Edition) are good knives IMO. Although I wouldn't really use Victorinox because they don't seem to be robust.
I used my Ontario RAT II D2, a little bit, but the blade is not centered anymore. The Kershaw Dividend (All 3 versions I own) seems really better in that way.
I was looking in the internet for a really cheap knife I would like, buy some of them and could use without taking care of them, just for my curiosity. I bought some Sanrenmu 7073 LUX for this two years ago, and still use them, but they often need to be sharpened their price was around 10 €.
I didn't buy any Ganzo for the moment, so I have no opinion about the quality of this brand.
The model that seems to be fine for me would be the Firebird FH21:
I like the blade shape and the size. It's a flipper with ball bearings, early liner lock, has real D2 Steel, and it would cost approximately $26 / 24€.
I like flippers with ball bearings and liner lock or frame lock. I also really like the action of my Sanrenmu 1161 but like less it's blade shape, and it's too heavy and too big to wear in my pocket all day long.
I think that Ganzo is creating this Firebird series, maybe later the Ganzo brand name will even disappear, because of it's past and detestable reputation.
I know it's a Chinese company, but I think that the best way to improve the situation would be to encourage them by buying their inhouse designed knives instead of poor copies.
What I also think is that even when some people make the mistake of buying copies, they are only bad copies and not more than that.
I don't think that nowadays a company can continue to exist only by making copies of other brands items.