Seems reasonable to me. Back when I started playing OpenTTD, about 20 years ago, you had to provide your own data files from your ostensibly legal copy of TTD. They changed that after they started distributing free alternative graphics, but to be frank the strict legal status of both OpenTTD and OpenRCT2 has always seemed mildly dubious to me, on account of both projects being based off disassembled code. Atari is being fairly reasonable and gentlemenly about this.