Given the detention in France I think the broader context of encryption policy in the EU is relevant as well.
The EU parliament has had multiple draft laws proposed over the past few years that intend to break private communication for everyday citizens. The proposals are varied, from the inclusion of backdoors to a requirement that service providers scan all messages for "CSM" (I put this in quotes because the content they actually want to track has nothing to do with minors and everything to do with class power). IIRC the current proposal is to just break SSL entirely by forcing browsers to accept certificates issued by the EU itself.
With seemingly random "terror" attacks occurring within the EU recently I can imagine that this will once again be used as the causus belli to go after private messaging and working class access to encryption. The politically motivated detention of the founder of Telegram is almost certainly part of the broader strategy to be able to surveil the thoughts of European citizens, residents, and guests. It's also worth noting that the founder of Telegram was already detained by some US alphabet agencies (FBI maybe?) years ago.
All of this fuss over various non-aligned messaging services is solely to further entrench imperial surveillance capabilities.
If it had anything to do with their usual excuses of counter-terrorism or child abuse they could just use the resources at their disposal and deal with most of it. Even when people use encrypted messaging the rest of their opsec is sloppy enough to find a way in if you're so motivated.