Well I can see why DB were miffed about the situation. Having donated the loco to a 'charity', to then see it in commercial use, even if it was 'only' WCRC, must have come as an unwelcome surprise, to say the least!
West Coast is a major player in the charter sector that DB also compete in, so they certainly are rivals in that sense, and I can fully understand why they might be a bit miffed.
Mildly miffed, maybe, but if you donate an asset to a charity (that presumably you now have little/no use for) then unless you stipulate something in a contract you can't really complain. Also, if WCR weren't using this on one of their tours I suspect they'd be using one of their own locos, so DB/EWS probably weren't losing out. And whilst DB do charters etc. it's not exactly their core business (like it is for WCR).
Anyway, back to the 60s (as the above "use after donating to charity/museum" topic has been debated in broad terms many times elsewhere) - I'd have little sympathy with DB after allowing so many 60s (and 58s) to rot away - and having no use for them other than scrap - if they were then miffed if the example(s) they gave to the National Collection got the odd run out (presumably for a modest income which in turn goes back into the Collection).
I'm not aware of the exact details of the contract at privatisation, but I also believe EWS (now DB) acquired the 60s (and the 92s and other locos) - which were then in decent condition - for considerably less than the millions BR (aka the taxpayer) paid for them only a few years before. So again, can see why they'd be miffed, but I'd have little sympathy if the public-funded NRM got a bit of use/income out of them.
All hypothetical anyway I suspect, as even if they eventual donate a reasonable example of the Class (60100?) it'll most likely be a static exhibit somewhere or be stored.
