> I had to turn off my MacBook because its automatic update "features" were consuming all of the available bandwidth
Which automatic update features, by the way? While I definitely don't like or defend such features, all the ones that I know about can be turned off—which gives a more useable result than having to turn off the whole computer! Maybe my Mac is silently doing some behind-the-scenes updating that I haven't noticed hitting my data, though.
(Windows 10 is the real pig here, though. Bye-bye, option to download only on request! Bye-bye, this month's data allowance before I realised that it was downloading what turned out to be a huge update! I did eventually discover how to designate a connection as 'metred', a nice feature that I wish Mac OS had.)