the problem we face is the following: some (not all) player want to experience more then just one or two fields of this game.
Single account
if you do this on a single account you are a jack of many trades but you cant compete in any of these field. you basicly will have a broken char. you can not realy earn good money anywere because you are nowhere good. and power in thse games come from specilization.
or you have to wait 5 more years. by paying but not playing. because playing with such a char will not realy be fun.
Multi accounting
this will allow to to experience the things that you would not be able to do on a single account. you can do multible specializations and you can experience all these parts. of cource this also involves more money which (as ever) brings the bad "pay to win" wizard onto the field. but honestly thats the way this damn world works. you pay more money and you get more. you can pay 4€ for a beer or 8€ for two. now the guy who can only afford (or wants to afford) to pay for one cries that the other guy has two and sais that this is not fair...
Multi boxing
this is a total different thing as multi accounting. yes you can argue that this is a bad thing and all the combat chars with their follow alts is not how its ment to be. also the solo mining fleets ... ...
but how you want to prevent it? you want to block having multibe games running at the same time? well this makes it even more p2w because now the guy how can afford multible PCs will still do it. so better for the rich but worse for the ppl in between. just more injustice.
or oyu want to block multible games from the same ip: well nice idea but what if two ppl in the same house (for example brothers living under the same roof) want to play this game over the same router. now you have to tell them that they cant. but in the end it will be not a real issiue. you can still proxy one or more accounts and it will still be possible. just a bit more work and just higher p2w levels.
so what can you do to prevent it. honestly not much. not much. you can make it harder, ppl will still do it, and you will have no real options to prevent it. not on a usefull lvl.
this is a sandbox. one of the very few. and i think multi accounting and multi boxing will always happen. you can make multi boxing a bit harder by things like removing auto follow... but still ppl with more money will find other ways. just look at the programs avalible in eve.
and as said: it provides better income for the devs. so why should they not allow it. in the end they would like to earn money with this and make a living and a profit from it. this might be fun, but its also buisiness.