I'm not thoroughly aware of their dealings, but these amounts of private investment aren't going to pay for themselves. If you raise 100 million, investors typically want a billion back, or more.

From the looks of it, Bitwarden might've tried to go with the Open Source model to get free development resources, trust (because it's an open source PASSWORD manager), and general goodwill. But now that they've deemed that got enough of a market share (or investors are starting to breathe down their necks), it's time to start raising the walled garden.

Even if they claim after the fact that it was a "Bug" that the client couldn't be built without their proprietary sdk. The very fact one exists is a bad enough sign, specially when its influence is spreading.

VC is a devil's bargain. Raising VC money is NEVER a good sign.