Ok, here are my bits and pieces so far:
(1) I don't expect them to deliver a certain service 'forever', they can shut down if they want to, I understand that
(2) they can change their policies but they can't (or at least, should not, it is painfully obvious that they can) make it opt-out if it is a major change (and to me, adding stealthy advertising is a major change)
(3) they can't use my name to make it seem as if I am on board with something when in fact I am totally not on board with that
(4) I'm fine with them acting in this way, but then they have to accept that I'll call them out on it
(5) web services (especially embeds) should default to grandfathering in older users
(6) This change does not appear to me to be in line with accepted practice and legal requirements for advertising, as such they are making me part of something I do not wish to be a part of, stealth advertising is something I am very much against.
(7) Had I received the announcement and had I seen that it was 'opt-out' I would have killed my disqus account immediately. Opt-out is the wrong way to make changes like these. To have no positive confirmation for a change like this is not acceptable to me.
(8) I feel they are sneaky because of the way the ad blends in, because apparently when I'm on my home machine those ads are not there (or at least, they were not until yesterday) and I feel that such changes should never be forced.