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i think I change my Avatar 2 times since 2013... first one was the face of jocker from batman comics, and then this one.
i dont know why I never change, its the same with whattapp for example, changed 2 times in like 10 years or more. facebook I almost never enter, and has the same avatar for years, its from a meme...
just a comment of colour. jajjajaja

Also depends if you're using Steam wallet or credit card.
For the 33 gifts I did 2 weeks ago, it was for giveaway here, so I didn't know the winners before, I added them and send them the gifts right after they accepted my friend request. I bought everything with Steam wallet only.
I think the thing to look is if the main activity of an account is trading or not, if you're advertising for trade and trade with other traders already suspicious.
There will always be false positive, like always with an automated system, but I think 99% of the time the algorithm can do the difference between someone who randomly buy gift to other and someone who actively trade for profit. (and maybe who's making the most money for Steam 😜)

They never gifted anything before these 2 games? Do you know if they used credit card or wallet, if it was wallet did they get the money by buying/selling in the community market? (like a stock market)
How many games do they have, and how many bought from the steam store? (not from resellers but steam only)
How many trade offer they made? and how many trade with nothing in return? (asking for items and giving nothing, or giving tiems and asking for nothing)
What is the level of their account and when did they create it?
If you have more infos that would be really cool to know, because there must be something that trigger the ban.
I'm worried about it happening to me in the future, so if we could somewhat guess what to do to avoid it (or to not do), that would be awesome.