Actually there is a difference between grocery store goods and publications. Grocery stores goods consumption is rival (if I eat this lettuce you cannot eat the same lettuce). Publications and information goods in general are non-rival. Once provided an indefinite number of individuals can use the information from the a publication without depleting it. The problem with collecting the value of publication is that it is very thinly distributed and very difficult to valuate a priori. So individual producers of the publications don't bother to try to collect on it's value. Publisher houses, working on bulk have the means to collect at least part of the value. It is arguable that the actual value of all the publications is higher than what is collected by the publishers, and if universally and freely available would generate even higher returns for society in general. The problem is in determining a priori what is the value of individual publications. It is also arguable that a the value of a very high percentage of the publications is NULL. We just do not have the means to validate and accredit the value. The best that can be done is open everything and let time and usage determine true value... Still there are no guarantees..

your eyesight is 20/20.

For interstellar or intergalactic migration of life there should be some type of transportation that we cannot presently think of. For all practical means, propulsion based on mechanical momentum exchange is limited to a few tens of kilometers per second. This hold true even if one can unlock energy sources of nuclear fission, fusion or anti-mater. Unless we can find some king of symmetry allowing teleportation, it's gonna be each species with it's own star system.

The explosion of an atomic bomb on the Earth surface will not change it's orbit, unless it send large chunks of matter into escape trajectory. Alas, even with the large energy release of an atomic bomb this is unlikely. No evidence of this effect noted on the many test carried out underground or the the surface. Remember that changes the orbit of a body on a gravitational field includes energy and momentum considerations. Further more, were this to happen we would have powerful rockets to send huge payloads into space.

The lunar gravity is approximately 1/6 of the Earth surface gravity, it is no micro gravity..

Inflatable is inherently leak proof. As for structurally resistant you have to consider that on the vacuum of the moon surface it will be pressurized (for human inhabitants); that makes it very stable. Maybe a better way would be to excavate a an underground cave and seal proof it with an inflatable liner.It should be much easier to excavate than 3D print it. You could use robots to do the excavation. Or look for some natural lunar cave. There are evidences that they do exist on the lunar surface