Adobe Digital Editions - question before I buy a Kobo

One of the things that puts me off the Kindle is that DRM'ed books can only be bought from Amazon and cannot leave the Amazon platform. That, and the recent kerfuffle over a Kindle user who had her account cancelled without explanation.

As I understand it, DRM'ed books you buy from Kobo can be transferred to other ePub readers using Adobe Digital Editions, and ePubs you buy from at least some other booksellers can be transferred to a Kobo device using Adobe Digital Editions.

Apologies if I have misunderstood, but does this just transfer the problem from Amazon to Adobe? Can Adobe revoke access to books? What if they cancel your Adobe ID? What if - hypothetically - they go out of business?

Thanks, looking to buy a Glo.