I googled Ubisoft's license agreement, and there are a couple of unpleasant points in what I found: https://store.steampowered.com/eula/298110_eula_0 https://legal.ubi.com/eula/ru-RU
Here, they state that we can be sued for mods that use their models.
2. OWNERSHIP.
All ownership rights, including intellectual property rights in the Product (including, but not limited to, all texts, graphics, music or sounds, all messages or information elements, invented characters, names, themes, objects, landscapes, costumes, effects, dialogues, slogans, locations, images, diagrams, concepts, choreography, video, audiovisual effects, domain names, and any other elements that are part of the Product, individually or collectively), as well as any and all copies of the foregoing, are owned by UBISOFT or its licensors. The Product is protected by national and international copyright laws, agreements, and conventions, and other laws. The Product may contain certain licensed materials, in which case UBISOFT's licensors have the right to protect their rights in the event of a violation of this Agreement. Reproduction or presentation of these licensed materials in any way for any reason is prohibited without prior permission from UBISOFT and, in some cases, from the licensors and representatives of UBISOFT. Except as expressly stated in this License Agreement, all rights not granted to you herein are expressly reserved by UBISOFT.
And here is a very vague wording – we are prohibited from creating "derivative works" from the product – and this includes maps and mods.
1.2 You may not, directly or indirectly (i) sell, lease, or grant temporary use of, license, distribute, market, or promote the Product or any part of it for commercial purposes, (ii) reverse engineer, decompile, disassemble, adapt, reproduce, or create any derivative works based on the Product (except where the Product allows you to create, generate, or present user-generated content using special features, for which you need to create an Account and comply with the Terms of Service), in whole or in part;