It would either have to be a personal reason or I'd think that the person did something foul.

Hard to say without any context.
Something could have been wrong with the GAs, like region-locked, giving keys late or bad keys or w/e.
If everything went "smooth" with the GAs, then it could be something as simple as a comment you made in a thread or a GA.

People can be really petty but it also doesn't really matter.
It only matters, if you did something "wrong" or in bad manners; so you could fix that.
Other than that, can't please everyone anyway.
And if people have personal issues, then they shouldn't be your issues too.

People BL for ANYTHING.
Mostly because you have a other opinion. A lot can't handle this.
I think a lot of them have not learned that you must not have the same opinion(s), must not be the best friends and can still respect and/or accept the other one or his different opinion.

I personaly BL for:

• Insult me
• Not know a thanks after winning stuff from me (i wait normaly a few days) -i not need a thanks from the people that jump into a GA-
• Use Autojoiners
• Extreme Leeching (examples: 3 years on sg with only 1 GA to be lvl 1, years on sg with statistics that say 200 won, 20 gift or stuff like that, since 1 year no GA made but won -big- in that time, only region restricted GA's -normaly 90% CIS and 10% South America-)
• and NEW ... for joining DLCs but have it already and/or have shady entries at sgtools (by that point i am very frustrated because at DLC's i have at least 3 rerolls each time.... much to much for "mistakes". So its clear for me most of them use autojoiners -_- ... but i not BL all of them, because mistakes can happen. You see it at the words they write... mostly came only a "reroll" ... nothing else. Friendly looks different).

At one of my last GA's, open for all with lvl 2 -i thinked i avoid a lot of the autojoiners, leechers and stuff.... but wrong thinked- i was so frustrated that i looked very close on the entries...
337 entries for my GA gave around 180 new entries on my Blacklist.
Thats the hard facts.

Open for all are complete infested (and all the rerolls make a lot of work for the support and the GA creators) :o(

I hope my explanations helping you :o)

I blacklisted a guy for a while, explicitly because he went out of his way to bother people. I found that distasteful and so I chose to not give him things I may give away. Of course I later removed him because he earned a spot in an event giveaway. Never did anyone else, I generally curate winners by selecting groups and levels instead.

Thanks for putting this up.

You said thank you
You didn't said thank you
someone just wants to made everyone win once
You won too much
Some different opinions
His mood is not good
Your personal homepage is not good
Your picture is not good
you friend is not good
he don't won
lvl 2 GA.

bless

Looks like you've gotten plenty input on potential reasons already. But it's their loss, not yours <3 I'm sure I missed a lot of level GAs before I started trying to hold GAs of my own, but BL for that seems a bit petty. Don't let it get you down, and thanks for spreading the GA love <3

Gracias ^_^