Even more so if it is free, it makes me think that the game is a lazy port of a mobile game or that it has malware.
On PC, unlike the mobile market, there is no concept that a free game must include adds, and if an offline game asks for an internet connection for advertising, it is usually considered something bad by many people.
I don't have data to tell you what percentage of people are going to pass on your game or give you a bad rating, but it is something that I have seen a lot in PC games and I understand that your idea is precisely to promote yourself and not get a bad reputation. .
Edit: Something that I have seen and that doesn't seem to bother people is the home page of the game, usually the menu. Include link to the developer's social networks.