Debian is great indeed (I am a a Debian developer myself although rather inactive) - but today’s news isn’t much of a change in whether SUSE is or isn’t on any definition of the dark side.
Why do I say that? Simply, as per the linked announcement itself, this takeover offer is by the current majority shareholder who already owns 79% of the company. They can already win any shareholder vote they want to win. They already control SUSE.
Most of what this will do is two things: one, pay the current minority shareholders of SUSE 67% more than their shares are worth on the open market, and remove the quarterly earnings pressures of the German equivalent of Wall Street from SUSE management, at least unless and until any future IPO or a sale to another public company. Not obvious that this transaction makes anything worse than it already was.
There could be a less obvious difference: SUSE currently has a German corporate structure with very strong worker rights including participating alongside management on the supervisory board. If they get rid of the German entity and keep only a Luxembourg entity, that may no longer apply, though German labour law certainly still would for employers based in Germany. I’m not an expert on any differences between German and Luxembourg worker governance participation rights, and in this paragraph I’m more raising a question than asserting anything.