Unity (former game engine company) has merged with an actual adware and malware distribution company. That's not an exaggeration. Fake Flash installers, was blacklisted by Microsoft's anti-malware tool, VirusTotal entires, that kind of thing.

https://blog.infostruction.com/2018/10/26/adware-empire-ironsource-and-installcore/

https://www.benedelman.org/news-021815/

Don't build your games on engines you don't have the source code to.

Adware Empire - IronSource and InstallCore

A recent Adware campaign using malicious Bing ads led me to a Chrome download that eventually deployed Adware to the user’s computer. The IPs and types of Adware connected back to IronSource Ltd., Babylon Software Ltd., and InstallCore – all Israeli companies that have connections to Adware. See her

INFOSTRUCTION
... if you can avoid it. Pico-8, GameMaker (though they're on some crappy subscription thing now), etc. are all OK for making smaller games. If you're going to invest many months or years of your life into some long-running project, maybe consider Unreal or Godot, instead.
@cancel
Is unreal open source? Or do you talk about all this other engines and only Godot give you their source code?
@Zykino Unreal Engine is "source available" which means you have access to the source code, and you can modify it for your own usage/purposes, but you cannot freely redistribute the source code.
@cancel
Oh I did not knew that. Thank's