It's not. Honestly I thought the same thing. I was like eh I'll try it. I got it and I have barely experienced any bugs. The bugs I have found aren't to bad. Plus it's in beta. But I've been playing games like ARK, Civ 6, 7 Days To Die, and so on. I haven't experienced any lag whatsoever. The games run amazing on good graphics. Plus if you want you can switch to a more powerful computer easily.
Basically Liquid Sky uses credits as a currency. I'm doing $10 a month subscription. Which gives you like 2,499 credits or so. Each minute uses a certain amount of credits.
With the Three different Packages,
You can see the lowest package, "Gamer", is the one I use. Which is only 60 credits an hour. The higher the package the more credits. But your not limited. You don't pay with money to get just one package. You use SkyCredits.