1. I’m not sure it’s a good thing to be sticking biological material from Earth onto the moon or other planets (yes I know there is Astronaut shit up there).
Why should there be an issue with the tardigrades presence on the moon? As you point out, there’s a 100 kg or so of astronaut shit already there, albeit in plastic bags, a bunch of microscopic bugs are hardly going to contaminate a sterile environment that’s permanently exposed to unlimited solar radiation, vacuum and huge extremes of temperature.
As regards other solar bodies, any exploration carried out is done with vehicles that are as close to sterile as possible, as on Mars, or are allowed to end their exploratory lifespan by crashing into an environment that most certainly will never suffer any harm, in the case of Jupiter and Saturn, to avoid any possibility of any satellites that have conditions that may allow life to evolve become contaminated.
Also, there are scientists who consider the possibility of life on Earth having been started by bacteria brought from outside Earth’s atmosphere…