Huh? Since when? This sounds really odd to me because my dad is obsessed with DIY and self-repair videos on YouTube and has never had a problem finding tons of such content to watch daily.
I suppose my usage of the word 'political pressure' is nonspecific to US Government entities and more toward the general definition of a general entity's real politik. For example, i would consider a small business owner paying into a protection raquet by a local mafia to be 'caving to political pressure'
I really think YouTube like a lot of tech companies will often just take the path of least resistance and say:
"Well that's a lot of DCMA complaints ... just ban'm if our magic script says to, whatever."
It seems like maybe favoritism to another big company, but maybe is just more a reflection of a crappy process and a tech company habit of just letting some magic formula decide and avoiding any extra time / resource consuming process.
Not to say I don't think it doesn't happen as far as some corporate to corporate pressure goes, but it's hard to know.