Most disappointing day here on Steam

Well, I tried to buy TWO gifts both around 1€ each, one last week and one two days ago.
Both purchases were blocked, I contacted support the first time and I got a message that my restriction was lifted and I was able to complete my purchase.

BUT, when I contacted support for the second block, I got this message:
"Hello,

Thank you for reaching back out about the gifting restriction you're running into.

You're running into issues purchasing gifts because we've detected unusual gifting activity on this account. We will not be lifting this restriction for you.

Using your Steam account for commercial purposes violates the Steam Subscriber Agreement and may result in the account being locked.

If you'd like to continue purchasing gifts on this account you'll need to do so using an alternative payment method. All of the payment methods available in your region will be listed upon checkout.

You won't be receiving any further replies regarding this issue.

Thanks for using Steam,
Sierra"

During the first block I bought a game for me to test the situation and it was completed.
During the second block, I used paypal and purchased was completed too.
Both gifts were for giveaways here on SteamGifts.

Please help me to understand:
1)What does "unusual gifting activity" means?
As I said, two 1€ games during the last month!
2)"We will not be lifting this restriction for you."
Does this mean that whoever got money in his Steam wallet and too many games and he wants to gift some is suspicious now?
3)"Using your Steam account for commercial purpose"
Are they for real now? I have spent 10.000s here for games and I finally realized that I won't play most of them so I stopped buying most games from the store, just bundles. Am I punished for not being a good customer anymore?
4)"If you'd like to continue purchasing gifts on this account you'll need to do so using an alternative payment method"
So my Steam wallet is not good, but my paypal IS?! They are robbing everybody with their fees and then they don't accept my Steam wallet for GIFTING?!
5)"You won't be receiving any further replies regarding this issue"
Best suppoort EVER?!