Anuke will also make V7 a Pay to Play version for Android, so eventually there will be a time when Mindustry is essentially fully Pay to Play.
I guess that means having servers and a friend system will come to android? who knows.
you can make a request on github. you can get servers for free. but low spec and have to renew after some hours. the fact that the game will cost money wont bother me. in fact he deserves the money. more than you can think.
PS: there is a trello page: https://trello.com/b/aE2tcUwF/mindustry-trello
and join the discord for more info and dev preview
and the game will remain free on itch (i think)