Is 'loan' as a verb standard? (Genuine question). I would only ever use it as a noun, and 'lend' as the verb.
'Borrow' and 'lend' are basically covered by the same word in German, sometimes, but not always, distinguished by prefixes. I wonder if it's the case in other languages too, and perhaps historically in English? Might explain some uses of 'lend'/'loan' as all-purpose (and the extension of that to 'borrow'). But then maybe not - you get people using 'learn' to mean 'teach', as well (but not the other way round). 'Bring' and 'take' can also be a bit elastic in some dialects. Bet there's a term for this phenomenon.
On a different subject: I can't help feeling it's a good thing that more people are writing these days than would have in the past, and am a bit reluctant to discourage that via over-zealous criticism of people's spelling/grammar. I think the numbers of people who actively revel in ignorance are quite small.