I find it interesting how it appeared clear in 2016 US election that Reddit for example was being a target of Russian interference, (alongside other places like Facebook and Britain during Brexit), even with Russia in a weakened state China appears to have seen what was being done as valuable and taken up the task
The playbook always seems to be to stoke wedge issues, including funding groups on both sides of the political isle; funding the NRA and BLM seems to be two of the most common examples. The reality being that the amount of disruption and destabilisation that is achieved, it must be that these governments must see it as good value for their money.
Idk how true that is, it'll be highly dependent on what you're trying to dissolve.
This sounds to me more like the advice I've heard for using isopropyl for sterilizing equipment and surfaces, its more to do with how quickly the pure stuff evaporates. Evaporate too quickly and it doesn't sterilize, whereas 70% is best of both worlds.