@Aldo22
I'm not 100% sure with regards to the general question. I was answering for the 12 and 14 bit models, which I was interested in for some time, but they were really not that compelling offers.
In any case, a typical factor is YouTube videos with reviews of lower-end scopes, like learnelectronics, Kerry Wong, etc.
In the case of the Hantek 2000 there is a thread here by DavidAlfa, in which he posted an improved firmware, overclocking instructions for responsiveness, step-by-step hacking instructions, and recovery help for the usual newbie blunders. That kind of resource for devices with no after-market support makes the purchasing choice a no brainer.
As for why that happened with this scope and not others, I can't tell, but my guess is that it was an attractive option at release, and the rest came behind and lost the momentum.
When the DSO-2D1X came out there were really no competitors in that price range. 1GS/s, actual MPts of memory, and not a few KPts, SG, and 150 MHz for around €200 (hacked ofc).
Maybe the first to market effect played a fundamental role?