Western-aligned powers have been dealing with this prickly aspect of unconventional warfare for some time now: opposing powers intruding into the collective consciousness of their populace to introduce well-designed, self propagating ideas that are harmful to their power base. This basic idea is nothing new, with propaganda being invented somewhere between communication and warfare on the human timeline. However, humanity has never been this connected to so many sources and proxies of information, each being a vector for malicious ideas to spread.
The harmful ideas are best described as a meme in the Richard Dawkins sense. They are harmful to western-aligned powers because these ideas can be things like "democracy doesn't work", or "the government is conspiring against us", or "capitalism is failing". I'm especially fond of the last one, because I don't think it's necessarily untrue - but it's harmful to the powers that be nonetheless. These ideas are not presented so simply: there's usually several layers of indirection, and some sort of built in way of defending against opposing ideas that would cause the harmful idea to be abandoned - this can exploit fear, pride or the need for group identity to do so, for example.
When dealing with unconventional warfare such as this, you have a couple of options as far as I'm aware: innoculate your own populace against harmful ideas; retaliate against opposing powers with your own harmful ideas; or mitigate and remove sources of harmful ideas. That's where events like these start unfolding.
The EU is facing massive disinformation efforts and political interference from external actors, and its fundamentally threatening those in power and their power structures. They are attempting to do number 3 here, and they are running into opposition in the form of free speech absolutism. Whether this is part of a smarter defense built into this web of harmful ideas or just convenient cover, it still results into the survival of those harmful ideas. As the world continues on a trajectory of polarisation socially, politically and economically, I fear we may see more and more of this sort of thing, and it will definitely be abused to suppress good ideas, not just harmful ones. I'm sure it's happening already.