itch.io

I wonder ... where do you get this information ...

That there were malware by the dozen on weekends is what happened and what probably still happens. You personally stumbled over several of them without trying. 

randomly downloading dozens or hundreds of games daily for fun ... just to check if they´re save to use ...

It is neither randomly, nor is a download needed. You also recognised patterns. They change, but within a week they stay noticeable. So it is a few seconds to have high confidence. And of course, I do not check all games. But enough to stumble over a lot of malware.

Oh, and I currently do not browse new games, but wanted to have a look how bad it currently is. It took me less than a minute to find two fake accounts. They have 16 followers together. How do I know? Experience and things I do not want to discuss, since they will change anyway with the next batch of malware uploads. Currently you would also be suspicous of those fake accounts ;-)

Oh, and I tried the smallest of the games out of curiosity and it did not trigger a single scanner on virustotal.

Browsing new games on Itch is dangerous. Using a sandbox is recommended.