It's mentioned that Mr Durov has Russian, French and UAE citizenships
which may shed a light on this legal conundrum and explain why he wasn't arrested overseas - EAW - and under what pretense given the fact that his company is UAE entity.
This is different from legal standpoint in regards to DSA dispositions. French authorities are accusing the company and him as the CEO for crimes of omission - specific felonies that suspected persons commited thru and with his platform where his company and him as responsible person didn't performed appropriate content moderation. Ad absurd - the CEOs of T-mobile or Vodafone may be accused because they didn't moderated the GSM traffic whilst certain charming terrorist groups, OCGs and intelligence services used their cellular networks for electro-detonator cap
The absurdity of EU, British and French inquisitorial accusations are obvious, though people still believe that it's in their interest not to
use cash, to report any suspicious activity or person and that being wealthy means that somebody is a criminal and that they should have their share thru tax.