I think it just might have to do with the history of Islamic terror attacks..
Such as the London bombings and bridge attack, Charlie Hebdo attack and the more recent stabbings in France, the Madrid train bombings which killed 193 people, the November 2015 Paris attack in which 130 were murdered, the 2016 Atatürk Airport attack in Turkey which left 45 dead, the 2016 Brussels bombings, just to name a few...
I'm not suggesting that all or even most Islamic individuals are dangerous/terrorists. But there is a long, bloody history of Islamic extremism throughout Europe.
I'm also not suggesting this justifies these bans in Italy whatsoever. I share this because it's essential context to answer your question.
For the Meta apologists, I have a reality check for you:
Threads was immediately subject to mass amounts of radicalizing, extremist content, and there have also been instances of users having personal information doxxed on Threads due to Meta's information-harvesting practices. [1]
Threads was marketed to be open to 'free speech' (read: hate speech and misinformation) and encouraged the Far-Right movement to join, who have spread extremism, hate, and harassment on Threads already. [2] Threads has been a hotbed of Israel-Palestine misinformation/propaganda. [3] They also fired fact-checkers just prior to Threads' launch. [1]
As already established, Meta also assisted in genocide! [4]
Meta/FB/Instagram also have a strong history of facilitating the spread of misinformation and extremism, which contributed to the January 6th insurrection attempt. [5], [6]
This really should be obvious by now.. but Meta mines and sells their user's information.[7] Just look at the permissions you have to grant them for Threads...
FB users have to agree to all sorts of unethical things in the TOS, including giving Meta permission to run unethical experiments on their users without informed consent. [8] Their first published research was where they manipulated users' feeds with positive or negative information, in order to see if it affected their mood. It did, and they successfully induced depression in many of their users!
I will now turn to an article that surmises well the core practices of Meta as a company:
Elevates disinformation campaigns and conspiracy theories from the extremist fringes into the mainstream, fostering, among other effects, the resurgent anti-vaccination movement, broad-based questioning of basic public health measures in response to COVID-19, and the proliferation of the Big Lie of 2020—that the presidential election was stolen through voter fraud [16];
Empowers bullies of every size, from cyber-bullying in schools, to dictators who use the platform to spread disinformation, censor their critics, perpetuate violence, and instigate genocide;
Defrauds both advertisers and newsrooms, systematically and globally, with falsified video engagement and user activity statistics;
Reflects an apparent political agenda espoused by a small core of corporate leaders, who actively impede or overrule the adoption of good governance;
Brandishes its monopolistic power to preserve a social media landscape absent meaningful regulatory oversight, privacy protections, safety measures, or corporate citizenship; and
Disrupts intellectual and civil discourse, at scale and by design. [9]