Transitioning to SSL / HTTP2 should definately come from the platform providers imo. It's such a huge undertaking, to leave it for dealerships to try to figure it out on their own just doesn't feel right to me. At Dealer Inspire our dev team works to ensure that each new website is properly secured at launch and we've migrated the vast majority of existing sites as well.
Aside from DI, I do know DealerOn recently switched to https and I've seen some DDC sites that were listed as secure as well - although I haven't heard if that is a part of a DDC initiative or if it was something that was requested by the individual clients (maybe someone here has that answer?). As far as I'm concerned, a more secure web is good for everyone. I'd love to see all the web providers in our space invest the time and resources to make the transition.
Aside from DI, I do know DealerOn recently switched to https and I've seen some DDC sites that were listed as secure as well - although I haven't heard if that is a part of a DDC initiative or if it was something that was requested by the individual clients (maybe someone here has that answer?). As far as I'm concerned, a more secure web is good for everyone. I'd love to see all the web providers in our space invest the time and resources to make the transition.