Yes, I believe I lost several games from previous D2D ownership changes.
Technically they are still around, but I lost a good amount when they changed ownership and re-branded.
Edit: I just went to the current D2D site and tried to login, and the site indicated that my account is ‘innactive’ so unless I want to fight with customer service it seems like I have lost everything. Not sure if I needed to login in periodically to keep my account active or what happened there.
Thankfully the last few recent purchases I was able to redeem on Steam at the time.