NEC had accusations of bracket rigging along with tournament delays and streaming issues (which Pig actually helped fix). FR had huge issues with brackets being changed last minute, people getting dq'd and moved to later pools, poor organization where non-staff players had to step up and help run brackets, massive delays, etc.
A lot of people complained, so Pig and 16bit spoke up about it and criticized KombatNetwork (who run the NRS side of things) and ShinBlanka's staff members involved (particularly a guy named Bobsmack) for these issues.
A couple months later, Big E makes a facebook post vaguely stating that a certain two people are going to be banned from his events. 16bit contacts him about it, and Big E apparently thought he was a player named SwiftTomHanks who tried to organize a boycott against his events, something that neither 16bit nor Pig had any involvement in or tried to do. 16bit offers to discuss the issues that have happened at these tournaments in person but doesn't get much of a response.
A couple weeks ago, this is brought up again. Big E and ShinBlanka accuse them of trying to bring down their tournaments and not willing to talk to them. Pig brings up that he did try to talk to him multiple times at Final Round and was ignored, and presents FB messages/texts showing where they both have tried to reach out to them. ShinBlanka then threatens to sue for slander and says he's done talking and they're still banned.
BTW, just so it's clear, this issue did not start at all with issues between these two and Big E/Shin. It was an issue between them and KombatNetwork, as well as some guy named Bobsmack who works under Shin. It only became an issue with the TO's when they instituted a ban.
Still TL;DR - NRS players had a bad experience at NEC and FR. 16bit and Pig spoke up about it. Big E thinks they're another person who tried to boycott his events and banned them. They try to talk to him and aren't given a clear answer if they're actually banned. Later it's brought up again and they're told they refused to talk to them about tournament issues. Pig and Bit stated how they have reached out to them and offered proof for it. ShinBlanka says they're still banned and won't talk about it and threatens to sue for slander.