One thing good to understand about EU and the European perspective in general is interoperability and enforced standardization. This is an area where, clearly, EU as an area is different from the U.S. where there is much more will and political power behind private business. Europe, by nature and by history, is quite a bit more "big government" and standardized plugs fit into that bill (no pun intended). It doesn't matter if it is private business and private ground, if there is a public interest there, it can and will be legislated.
It is the same with standardizing micro-USB charging or whatnot (although Apple managed to lobby that bill to a pointless version of the original) and interoperability clauses have also been more prevalent in European copyright legislation. Even mobile phone networks have been more standardized in Europe, even though it is not a federation like the U.S. In the same vein, it certainly can be argued that a standardized EV charging infrastructure, in the long run, will benefit the consumer by offering them real choice of an EV, as the infrastructure will be the same for all. If you lock people into your proprietary ecosystem, that can hurt competition and development of technology.
This hit the CHAdeMO first, when it was attempted to be replaced by CCS (of which Type 2 is basically a part). Considering CCS covers both AC/DC charging and is the prevalent plug in European EVs, Tesla's own charge port included (with standard European home/industrial sockets rounding out the rest of the requirements), it could certainly be argued there is no need for CHAdeMO or proprietary Tesla superchargers in Europe. CHAdeMO was the first to be hit (as an Asian backed concern), but as I understand it, the legislation turned into allowing CHAdeMO as long as CCS is there too. Now it seems to be Tesla's turn.
If Tesla turns into the iPhone of cars in the sense that everyone else is running on standard connectors and chargers, while Tesla and only Tesla is running on their proprietary network, this will create an unfortunate standards split in the market. I'm not sure, overall, if we'd be better for it - twice the charging networks, for example. Or, say, Audi (hah!) decides to do the same and we end up with three charging networks, incompatible with each other. That's not a very good direction to go to, as a world. CCS vs. CHAdeMO is more of a traditional standards fight (compare to Blu-ray vs. HD DVD), Tesla is more reminiscent of Apple's lighting port vs. the micro-USB, so different stories there too.
That is just the background of what - I think - is behind this and what they are trying to achieve through legislation. They are trying to make sure anywhere you park your EV for charging, it will be compatible with your car. This is the long-term goal, just like with gas stations (which, again, unlike some place U.S. carry diesel also as standard). I don't doubt there is also huge pressure from the German automotive industry, a powerful player in the country, which is also in large part owned by the government due to WWII history. They have hedged their bets on CCS, hence CHAdeMO and Tesla are being targeted.
Now, as a Tesla owner, I have mixed feelings about this. I think Tesla is doing the EV thing a huge favour and all of us, heck the whole of Europe and the world, should be thankful someone is doing the heavy lifting. Tesla should be rewarded for that, not punished with legislation that can hamper that progress. So, certainly, there are two sides to this story.
I guess what, in the end, I would like to see is widespread standardization happen (a standard public charger with a single widely compatible plug available in every street corner), while allowing for sparse "botique" experiences like the Tesla Supercharger network to complement that (a long-range charging solution available widely enough to be useful but sparsely enough not to be an issue for the world at large, even if a few different manufacturers were to run similar things).
Even in France I'd expect this will hurt sales.
