Comment by Arainach

Doing the research takes time and energy.

Switching takes time and energy.

Changing all your passwords after you switch so they aren't potentially exposed in the next LastPass break takes time and energy.

People have a lot of things going on and have to make a decision about whether the risk justifies the effort.

Then there's feature gaps. LastPass is available on all platforms, has convenient sharing, a good story for emergency recovery if I'm incapacitated and want family to get access to things, and support for 2FA options such as Yubikey. Most competitors lack at least some of those, which is an issue if you're relying on them.

Personally, I left Lastpass for 1Password several breaches ago, but it took me a couple weeks of research to decide where to move to, at least a week of changing passwords on sites afterwards, and however much time and energy it took me to help others who I share credentials with switch at the same time.