Check the console of your browser. Browser's aggressive privacy controls may be automatically blocking the json call to reddit's api. (right click, inspect element)
Doesn’t work for me on mobile (IOS) too, unfortunately. I have adguard, firefox focus extensions on safari, and use Mullvad’s DNS blocking. I’ll have to go check which of them is breaking it, but I hope I won’t need to turn off anything huge for it to work. Either way, thanks for this, I’ve been using SinkIT for reddit to get a better mobile viewing experience, and this may be a better alternative.
The link appears below all the content that is loaded. Since there is some setting in your browser blocking the loading of one XHR request to Reddit the content doesn't load at all and the BMAC links appears at top. Donating is completely optional and I don't expect people who can't see the content will donate anyway. However once in a while when someone donates I get some satisfaction that people are using what I built and are happy with it.
Though I agree the link is too big and feels like an AD I will make it smaller, or you can just fork the repo and remove the link entirely.