Morde wasn't played in any actual pro game since he was disabled until 9.13 and he was pushed back again until the start of next week (at least for lck I'd assume for all leagues though). That being said it makes sense pro players are spamming him in solo q's. By the time he's available for actual professional games they'll have him for a week or two tops before he's gutted. He's got a ton of counterplay and he's a bad matchup against anything that's meta atm.
He's way too open to early abuse as a jungle pick. The top pro meta is basically all lane bullies or multi dash champs who should have no issue evading him and/or just abusing his early game weakness. Same can be said for midlane though at least SV is a good purchase for him if he's against a mage. He could maybe work in a hard engage bot lane comp, but then again why not just take yas's kit instead? (see recent lck match) Other than needing an AP champ to round out a comp yas is much stronger (multiple cc's, much better mobility, an ult that isn't super unreliable, hyper scaling, that whole windwall thing that makes adc's useless). Also there are much better ap options who have dashes, unconditional shields, hard cc's, burst dmg, etc. His only point of strength is his very unreliable ult which is made completely useless with an item that has a shorter cd.
HE really doesn't bring anything to the table that pro teams desire (hyper scaling, reliable engage, long range/hard cc, single target burst, ridiculous mobility). After this next set of nerfs hit him he's going to the permanent bench with all the other "juggernauts" (aatrox and urgot aren't true jugg's they have gap closers and trundles existence is only to R sejuani). Maybe he will get some pro play next week but either way come 9.14 he's dead to the world.
Rip morde 9.12 - 9.13.