Basically most mods can't be touched by mohjang, because they are base-class-free. They could attack the forge, modloader etc.
So as technic doen't modify base-classes it has nothing to do with Mohjang. But every modder that is included in the Tech-Pack could sue the creators for including there mod. At least they can force them to remove there mod, this is pretty easy (and cheap) if you have an insurance for this.
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As for spacetoad and flowerchild. We all know what they're really doing. They've formed a childish alliance because of attention problems, it's really as simple as that. FC literally quit forge after complaining about Eloraam and her involvement with forge, and someone pointed out that according to change logs, he'd been doing nearly nothing for quite a while and Eloraam was putting out huge fixes and changes constantly. While I know that for sure, I can't say the same for spacetoad since he's far less vocal and aggressive then FC, and can only speculate based off what's been going on. What seems likely is that since Eloraams Redpower has been adding a lot of functionality that makes BC a bit redundant in some areas. It's not an intentional dig from Eloraam but its still true. She's taken a lot of his popularity, especially since she's become so involved in technic and forge. They might as well call their new mod pack "Please don't use RedPower!"
Well first, Eloraam needs to be involved in Forge, because basically she uses quite a lot of the hooks in there. Certain people might already call it Redpower-API, but basically this isn't at all important. She has great knowledge and the dispute between her and FlowerChild was about the amount of modified base-classes. He wants modders to mod without changing baseclasses, so they won't require many hooks in Forge. Because every new base-class forge modifies makes it different to use with other APIs that modify the same class (Optifine actually had that issue). So his argument is totally valid, and the main problems will be solved if the official API is released.
Why SpaceToad and FlowerChild created BtB is quite easy. They like each others mods. It's the same reason why eloraam wants to create a combatibility module for Industrialcraft. So basically FlowerChild mods just for his own fun. He wants to create a Mod that he himself likes to play. If others like to play it too, thats good, but he doesn't care about that. Actually he don't get money from modding (he don't even use adfly-links). So thats why he drops forge, because it doesn't matter to him. It may matter to some people that play his mod, but as he stated it isn't his intention to please everyone with his mod.
SpaceToad basically improves Buildcraft via 3.x. Buildcraft still is easier to use and set up than Redpower and the powering of most simple mechanics is quite easy. That's why Buildcraft still has it's place. And Eloraam always said, that it isn't her intention to render Buildcraft useless. With the development of Redpower Buildcraft more and more becomes what it should be BUILD-Craft. The Filler and the new options to build roads, walls etc. over long distances makes Buildcraft unique again and usefull.
So basically you shouldn't quesion why a modder does this or that. They don't only create mods so that we can play with them. It is a hobby and it should be fun and if it isn't you should stop or make it fun again. And if he doesn't want BtW to be part of the technic pack that is his personal desicion and should be respected because it is his work.