About HB banning accounts for "trading"

Don't give away gift links. Just get the keys, and give them to whomever. While that's not 100% foolproof, it's about as safe as it can get. Of course, you do still run a risk, but I at least haven't heard of anyone getting banned while using the keys. HB can't really track the individual keys in that manner, I think. Be sure not to "connect" (or link or whatever they call it) your own steam account on their website either, just to be on the safe side, if you're that worried. It shouldn't cause an issue, but you never know, of course.

They can ban in case if you will use gift option for the games which you'll GA - they will see that different accounts activate these gift (so you will be marked as trader or someone like that).
But if you'll reveal key and give away key - there will be no issues.

Upd: Jinxtah was faster :) All these years I have Steam linked to my account and I had no issues

As others have mentioned you are way less likely to attract their attention if you don't use the "gift" links.
I just wanted to add that as a EU citizen, you are protected by EU consumer laws from abusive TOS like theirs and there has been many instances of EU citizens getting their account blocked and telling them they had no right to do that under EU laws, and getting their accounts back.

So don't worry yourself too much. Just use the "redeem" feature, copy the keys and paste in the box when you make your GA. If anything ever happens with support (it shouldn't), just tell them politely to fuck off and you'll be fine.

Use keys only.
If you write to HB support - never mention steamgifts.
And you should be fine.

i will add my bit it in - i had a year of choices and traded almost every single game from them (or rather my son did) and never once got told off

Use keys only. Never have a problem with it. HB can't know which keys are his.

If you are from EU, you can use gift links. HB doesn't dare to break EU consumer laws.

I was one of the people banned but got unbanned.
Pro tip coming from someone who took the bullet from HB:

Never ever create gift links.
Reveal the key and give that away, that's as safe as it will get.
They track gift links.

When the game is from HB, I always give the winner the game as a key. I've never had an issue.

I had issues with humble in the past where they claimed i sold some keys i actually had activated on my own account , and therefore that made them refuse to support me about any future issue i had with them cause that was breaking their rules.

I hardly ever rly used them since tbh . Maybe 2-3 times in several years .

Honestly i think the policy they have they have is stupid and i really disagree with the way they handle it .

Some people never had problems with trading and selling gift links, but other people have had their accounts locked when they just do giveaways here. It's unclear exactly what causes them to flag accounts, but the whole issue seems to revolve around gift links so gifting/trading/selling keys is most likely safe

Some more reasons to use keys rather than gift links. Keys are easier to activate (less steps). You immediately receive entitlement to a game with keys, whereas if you later try to give a gift link, you may find that keys for that game have sold out and are no longer available. This actually happens. Take the key ASAP.

Wow! I had no idea this was a thing. That's crazy to think you can't trade once you purchased their bundles/humble choice. I get that you have restrictions via gifting, but with codes, it makes no sense, as it's already claimed.

I've not had any problems with this myself, but it's utter nonsense. What I choose to do with the product I buy is my own business. Imagine buying groceries from the store and being banned from returning because you gave that food to homeless people.