Guilting would be acquiring multiples of a single unit, which is still a very common practice in the majority of gacha games - whether acquiring multiple of a SSR summon in Granblue, to combining a 5* to 5*+++ in RK, etc.
It's also mechanically slightly different, in that firstly, rate-up banners typically would allow you to get multiples of a select few items, and secondly, outside of that you can do this over a long period of time.
Kompu gacha practices that are frowned upon are basically gaining a few different gacha rewards, and the need to do it now. Which is essentially what the SRK ultimate prize is.
I mean, yeah, in the end it's all basically gambling when you boil it down to its essence. The 2012 ruling in Japan (unfortunately) had more to do with 'okay, this crosses the line' than a fundamental 'okay, well, the entire practice is dumb to begin with'. There's quite a difference between whether something is legal, and whether something is morally right.
