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I've never seen a direct quote but the rumour was he considered his games finished and as he wanted them to be

From what I've seen, he considers them piracy.

But...you need to buy the game to even play them. Of course you can pirate the games but that has really no bearing on OpenRCT2 itself.

OpenTTD doesn't require assets to be played

Short form, he's one those "my work is perfect the way it is" artists: https://www.tt-forums.net/viewtopic.php?p=971373#p971373