This sort of crap is nothing new unfortunately. Erdogan's Turkey has been abusing international cooperation agreements at scale [1], not to mention holding up Sweden's entry to NATO, purely to fight against legitimate domestic resistance against his quasi-dictatorship/sultanate/caliphate (depending on whom you ask, but Turkey is certainly no democracy anymore). And that repression includes journalists such as Deniz Yücel [2], even foreign TV shows [3] and comedians [4] - everyone who criticises Erdogan or recognizes the Armenian genocide becomes a target.
And where legal avenues fail, there is always the Grey Wolves, nominally a terrorist group, and closely linked to the Turkish government, to do Erdogan's bidding [5].
As for why no one does anything to hold Erdogan accountable... the answer to that is simple, he threatens to unleash refugees like he did in the past [6], and Turkey's cooperation regarding the Bosporus is vital in the Ukraine war.
[1] https://www.justsecurity.org/87260/after-spotlight-on-red-no...
[2] https://en.wikipedia.org/wiki/Deniz_Y%C3%BCcel
[3] https://en.wikipedia.org/wiki/Erdowie,_Erdowo,_Erdogan
[4] https://en.wikipedia.org/wiki/B%C3%B6hmermann_affair
[5] https://en.wikipedia.org/wiki/Grey_Wolves_(organization)
[6] https://www.dw.com/en/eu-strongly-rejects-turkeys-use-of-mig...