*Sigh*
https://youtu.be/avYPPqfmTwU theres no way this couldn't be in the mcu. Tone doesn't matter. Suicide Squad has a completely different tone to Man of Steel.
They clearly intended for them to be in the mcu. Nothing else matters except that. Limited crossover? Oh come on. Offical word is enough.
Agents of S.H.I.E.L.D. Season 1 features the dogs of hell, a biker gang, that later appears in Daredevil Season 2 and are later put down in The Punisher
Crusher Creel in Agents of S.H.I.E.L.D. is the last person Jack Murdock, father of Daredevil, boxes before he is murdered.
In Agents of S.H.I.E.L.D., Micro, a main character in The Punisher, helped the team offscreen.
The Battle of New York, of cause.
WHiH Newsfront appears throughout. That is exclusive to the Marvel Cinematic Universe.
A news report in Agents of S.H.I.E.L.D. Season 3 mentions a gang war in hells kitchen.
Cloak & Dagger has a major Luke Cage crossover, with both shows referencing each other.
The Judas bullet from Luke Cage appears in Agents of S.H.I.E.L.D. Season 4. Thats proof. No more needed.
The Raft, a prison for superpowered persons is known to Jessica Jones.
You know what? Here:
Daredevil
http://marvelcinematicuniverse.wikia.com/wiki/Daredevil_(TV_series)/Trivia
Jessica Jones
http://marvelcinematicuniverse.wikia.com/wiki/Jessica_Jones_(TV_series)/Trivia
Luke Cage
http://marvelcinematicuniverse.wikia.com/wiki/Luke_Cage_(TV_series)/Trivia
Iron Fist
http://marvelcinematicuniverse.wikia.com/wiki/Iron_Fist_(TV_series)/Trivia
The Defenders
http://marvelcinematicuniverse.wikia.com/wiki/The_Defenders/Trivia
The Punisher
http://marvelcinematicuniverse.wikia.com/wiki/The_Punisher/Trivia