Not sure if it's Boost or YouTube Revanced at fault but got the following error when I tried to open a Lemmy link to a video: https://postimg.cc/q6sW77x0
Also, the sign-up journey is a bit confused. Clicking sign up takes me to joinlemmy, which then just lands me on a home page for whichever instance I click. Might be more user friendly to prompt for a choice of instance and take them directly to that instance's sign up page. And maybe have a button for "not sure? Explore here" or something similar that would take you to joinlemmy
The few I checked were, but not sure if the path is defined as part of the Lemmy protocol.