Even if Wikipedia and other respectable sources have equated TCG's to CCG's, the words that compose those acronyms still have a meaning. People's use of those might have been deviated a long from those terms' intended purposes, but the subtle (if hard to notice due to everyday use) difference is still there.
Do you remember when the TCG term originated? It was to avoid potential lawsuits from WotC due to its M:tG franchise. I believe Topps, Upperdeck and Decipher were the first companies that had to come up with alternative definitions, which in turn derived from even more terms (for fear of others' lawsuits). We witnessed in the 1997-2000 period a massive corporative circlejerk that ended when TCG became the new standard term.
Years later (2003?), WotC showed how aggressive they can be when they sued Nintendo over the Pokémon card game. They made clear that threats of lawsuits were completely serious.
After the publication of the reviewed Reserved List (don't remember the exact year, but 2002 kinda rings into my head), M:tG's term of choice was TCG (yes, from CCG to TCG) to help players to understand the changes and how did those affected the game.
Does this mean that M:tG was previously untradeable? No.
Does this mean that M:tG was no longer a collectible? No.
Then, what's the difference? None. The game is exactly the same, what changed was a relatively unknown policy used by the company that makes it.
So, if for us players the terms are interchangeable (and companies can label their games whatever they want), what is the real difference between a TCG and a CCG?
The word meanings.
Sans marketing and legal interests, the words 'Trading' and 'Collectible' still have a purpose in their acronyms. The words still retain their definitions, regardless of current trends. There were a few actual CCG's (with no trade aspect whatsoever) that labeled themselves all sorts of stuff: BCG (Battle Card Game), XCG (Expandable Card Game), ICG (Interactive Card Game)…
Yet, the difference should be obvious: TCG's are meant to be collectively and individually exchangeable. CCG's could, but the main point of a CCG are their collectable characteristics.
So, we end up with Alteil being a Collectible Card Game, with no Trade aspect whatsoever. You can completely say Alteil is not a TCG. But hard to say it's not a CCG, because it fits the acronym's meaning to the letter.
Excuse me for the harsh tone in my previous comment, there were no ill intentions there. It's just infuriating to have to repeat myself.
TL;DR
It's all about the literal meanings of the acronyms, not about their actual, corporatively-corrupted uses.
(BTW, someone needs to clarify that Wiki's article, since there seems a lot of original research material there).
