To have one entity that controls all three(+) factions, they must have a goal that is not depending on the success or failure of any faction – it will most likely depend on the fact that there are multiple factions opposing each other.
Who is gaining anything from chaos and discord? There are several candidates present in the book:
Captain Xendros. She is essentially a foreign agent that cares only about fish for her country, and magic items.
Keledek. Just like Xendros, he uses the smugglers to get access to magic items, but he gains security by having a strong-ish government that protects his property.
Granny Nightshade. The more inner struggles Saltmarsh and Keoland have, the less they will bother her. The Brotherhood can be a good tool for her to keep the power of the others in check.
The Sea Princes. Although the loyalists hate them, supporting this faction will keep the smuggling operations more profitable, and the princes may also get insight in possible Keoland secret plans through the loyalists. The Brotherhood gives the princes a tool to kill their adversaries in all of Keoland.
Another option that I have thought about is Xolec. Maybe he is connected to other vampires like Strahd? Then there may be Vistani involved as messengers?
In this case, the bold parts in paragraphs 1 and 3 highlight the same line of thought (Trump's allegations are echoed by many), where none of the important parts of paragraph 2 (it leads to harmful effects) are bold are all.
The speed that you get through your rj45's depends on the quality of the cable used, both 'in the wall' and from the socket to your device.
For 1Gb/sec they need to be cat 5e or better.
If it's a recurring villain, I would give them legendary actions which usually do exactly what you describe: it allows to make another attack, or use a feature. It is also not in the same turn, so it would even enhance their sneak attack (assuming they have that, too).
To have one entity that controls all three(+) factions, they must have a goal that is not depending on the success or failure of any faction – it will most likely depend on the fact that there are multiple factions opposing each other. Who is gaining anything from chaos and discord? There are several candidates present in the book:
Another option that I have thought about is Xolec. Maybe he is connected to other vampires like Strahd? Then there may be Vistani involved as messengers?