Some recruiters may think that you want your initial to be included. I’ve seen multiple posts talking about purposefully ignoring communication when there are small spelling mistakes in their names. Missing a whole initial may be one of those red flags for some.
In the US, at least, the 99% of spam templates are using just the first name so you get "Hi, George W.! I am impressed with your work at Arbusto Energy, when can we hop on a quick call?"
