It’s legal to scrape websites and this is doing it in a way that activity pub is designed to support. You can’t be mad another instance is reading your data, that’s what the fediverse is.
I think people will end up finding bridgy annoying frankly, but it seems like a useful tool that takes federated content and lets websites build things that used to be only available by adding Facebook pixel and Twitter links to your site.
It's not even a fight. Bluesky lost a long long time ago when they launched an incompatible protocol with less features and worse UX and have done absolutely nothing to address this other than add curated feeds which barely work in the first place. Bluesky is so far behind that calling it a fight is just silly.
I don't like bluesky because I don't like it's owner. I don't like the owner because he thinks everyone is dumb and forgot the fact that nobody pointed a gun on his face to sell Twitter to some Arab dictators.
Relay/instance admins can choose which content goes through their relay on either platform
On nostr, your DMs are encrypted. In Mastodon, the admin of the sender and receiver can read them, as can anybody else who breaks into their server
On nostr, a relay admin can control what goes through their relay, but they can't stop you from following/DMing/being followed by whoever you want since you are typically connected to multiple relays at once. As long as one relay allows it, signal flows. Nostr provides the best of both worlds: moderated "public squares" according to your moderation preferences, autonomy to follow/dm/be followed by anybody you want (assuming that individual user hasn't blocked you).
On mastodon, your identity is tied to your instance. If your instance goes down, you lose your follow/followee list, DMs, etc. On Nostr, it's not, so this doesn't happen. Mastodon provides some functionality to migrate identity between instances but it's clunky and generally requires to have some form of advanced notice.
Both have all the same functions as twitter: tweet, reply, re-tweet, DM, like, etc.
Software developer Ryan Barrett found this out the hard way when he set out to connect the AT Protocol and ActivityPub with a bridge called Bridgy Fed.
Barrett planned to make the bridge opt-out by default, meaning that public Mastodon posts could show up on Bluesky without the author knowing, and vice versa.
In what one Bluesky user called “the funniest github issue page i have ever seen,” there was a heated debate over the opt-out default, which — like any good internet argument — included unfounded legal threats and devolved into bizarre personal attacks.
As a nonprofit, Mastodon’s appeal is that, unlike Instagram or Twitter or YouTube, it’s not controlled by a big corporation that needs to make its investors happy.
The ideological issues around Bridgy Fed are likely to continue stoking tension across these federated social networks as they increase their connection points.
“I am thinking and feeling deeply that however content moderation works on either side of the bridge, it needs to be at least as good as it is for native fediverse users, and vice versa,” Barrett said.
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I think not wanting to federate/bridge with Bluesky is a very bad idea. The entire idea is that we should get a Fediverse that is as connected as possible, not split up into many tiny subsets of users.