I think there is a place for both end-to-end encrypted file uploaders and non end-to-end encrypted file uploaders but the speed is going to be a lot slower for end-to-end encrypted file uploaders.

I think the only reason you haven’t seen wormhole.app recommended much is because it’s not open source (not that it matters for browser-based senders). There is also send.vis.ee witch is open source and recommend by privacyguides.org.