Password strength checker (Udemy course)
Use requests built-in validation
This:
if res.status_code!=200:
    raise RuntimeError(f'Error fetching: {res.status_code}, check the api and try again')
else:
    return res

should not raise manually; and should be replaced with
res.raise_for_status()
return res

Hash checking
In get_pw_lead_count, hashes_to_check should be marked : str. Also, if count is a string - likely, since it comes from a split() - you should cast it to int() before returning it.
Real arguments
args=list(input().split())

is not a standard way of retrieving arguments. Instead, use argparse and pass arguments via command line parameters.
It's also possible to retain stdin input as you have it, but you should in that case show a prompt.
Indentation
Count the number of spaces for each of these lines:
    if count:
         print(f&quot;Change your \&quot;{passwords}\&quot; password as it's pwned {count} times&quot;)

Each should be a multiple of four.