Legal, yes. Harmless, no.
We can agree to disagree here, but I'll take the security of the network over the misuse of botnet miners any day.
I don't share your opinion so yeah, we should certainly agree to disagree.
I get that it's near the bottom of the list on whattomine, but that doesn't necessarily imply that it is dominated by botnets. It could be enthusiasts (dedicated/dumb people), it could be many people mining with their laptops because they don't care about the couple dollars in power costs that will accrue over a month, it could be people with access to corporate/university clusters that they mine with while idle (while similar to a botnet, I wouldn't consider it the same). It could be a lot of things, but you insist that it is a botnet dominated coin without offering anything except for the profitability relative to other coins.
There are
some of each kind of miners just as I said but almost 20 BTC worth of Monero is being mined every single day and GPUs are not that much profitable than CPUs and we know huge botnets exists (there were several clear proofs of that in the past) and what else botnets would mine then? Certainly not magi or whatever low-volume high n-factor scrypt-jane coins or whatever fringe CPU-friendly coins are out there especially after some crpytos like VTC changed their algo just to avoid botnets.