foxy-miner VS P2PoW

Or you can use turboplotter for plotting https://blackpawn.com/tp/ And use foxy-miner https://github.com/felixbrucker/foxy-miner or blagominer https://github.com/quetzalcoatl/blagominer for mining. And run your own node and wallet with https://github.com/burst-apps-team/burstcoin

Yes its viable to mine burst. Plotting will take some time but it will be faster than chia plotting. You can start with btdex which is all in one solution. But you could also use Turboplotter for plotting which is faster and can use gpu if you have one. For mining use https://github.com/quetzalcoatl/blagominer or https://github.com/felixbrucker/foxy-miner

I am learning about nano, and I am a big fan so far. I am trying to wrap my mind around distributed proof of work (DPoW) and similar projects (e.g. P2PoW) and whether they have potential to violate Nano's core principle of being energy efficient (and feeless). I think for this to really be a concern, these services would need to be abused by spam attacks (like the current attack)

That said, PoW doesn't have to be subsidized by third parties forever. Wallets could introduce various kinds of fees to cover their expenses with calculating the PoW on their own servers, for instance. Then you have systems like https://github.com/anarkrypto/P2PoW that seems to incentivize PoW providers more directly (I haven't explored it much yet).