It’s not only “where” a wormhole would lead you, but also “when”. In fact, if both ends of the black hole are, say, in two places where gravity is different (like near a neutron star and in deep space), the two would age at different speeds, meaning that the time difference between entry and exit would vary.
Basically, wormholes would allow for time travel. And I’m not even sure constraints that can be applied on FTL travel to prevent its secondary use as time travel (special reference frame for the sake of FTL, prevention of movement that would create a close space-time loop…) can be applied to a wormhole.
That’s negative matter, not anti-matter. The difference, IIRC, is that negative matter is “made” of negative energy, and has fun propreties like negative mass (it repels instead of attracting). Both matter and anti-matter are “made” of positive energy, which is released when opposed particles collide.
For what I know, there could be negative matter and negative anti-matter, releasing negative energy when colliding their opposed particle.
If negative energy can exist and be created/haversted in this universe, one could indeed use it for fun stuff like antigrav, and space bubbles described with the Alcubierre drive, but this one has problems on its own (as in, requiring more energy than contained in the observable universe, flash-disintegrating any planet at the exit point…).
So, better to not try to tie it too much to this one.
In the old forum, the Infinity universe was described as having a few giant stargates for ships (by pairs, IIRC, not network), mostly to connect the three distant cores. It was supposed to be possible for an end-game player group to build one in the MMO, but probably as one of the hardest, more demanding assets of the game, including massive run and maintenance costs.
That would work better than natural wormholes, IMHO : not only does it stretch suspension of disbelief less, but it also means that those gates really bring something. If not, there wouldn’t have been built in the first place.
Giant pick-up ships were suggested in the old forum instead of gates IIRC, but then if they are fast enough to cross galactic arms in seconds or minutes, the question is, why aren’t capital ships equiped with similar drives, and why can’t those ships be used to go from anywhere to anywhere?
Stargates are simpler, more efficient, and make more sense IMHO.
And what with people wanting quasars? Genuire question, it feels like each time there is a thread about exotic objects, someone is asking for quasars, despite it making as much sense as asking for radiogalaxies or Great Attractors in the Infinity galaxy.