From a UX standpoint, nothing. From a mission and goals standpoint, centralization. If the bridge is taken offline it will create a hole in the network.

Have you tested fediverse bridges? Do they work, are you interacting with fedi folks, do you recommend adding mostr and/or other fedi relays by default? If fedi is significantly larger than nostr at this point are there issues with nostr users first point of contact being fedi users?

How many other quality bridges are there? Are they 1:1 same as mostr?