Sometimes I use instantgaming. Is that a bad thing? It always works perfectly.

I've used Eneba for a few things and I've only had 1 bad purchase that was refunded pretty fast. I really only check it when I'm looking for something that's kind of old, but is still full price or damn near full price on most storefronts. Like you can get Skyrim Anniversary Edition or Fallout 4 GOTY edition on any platform you want for like $3 instead of $50-60.

I used it to get Sims 4 and every expansion that was out at the time for $10 total.

There is absolutely nothing wrong with buying a key on G2A but you're asking to get ripped if you buy some mystery pack. Just buy the specific game you're looking for if it's the cheapest deal. I buy a lot of my games on there because many times it's the best price but I've never purchased those mystery bundles.

I've bought a ton of stuff (both games and DLC) from G2A and never had any issues.