HC factically started her campaign right after the first Obama's term, had support of party leadership, and therefore major party donors, and having sympathies of the press. DT started his campaign a year before elections, was rudiculed by mainstream Republican opinion-makers until May 2016, was (and is) in a conflict with major donors (like Koch brothers), and had/has generally unfriendly relations with press. So unless you imply some very big conspiracy theory I don't see how he could have even a chance to outspent HC.

I'm not saying that. I'm just saying that campaign finances are only a partial picture.

I also think HC had much more backing.