I see the people here posting on your comment being so nice and actually replaying in the most ethical way you could imagine! I am impressed by the community here on Itch.io and you should as well based on getting a strong statement like "complete bag of garbage" and you know better how much your words can pick a fight.!
With that being said, YES! you are right about the majority of games here, and there are many reasons, some of them have been mentioned above! However, being here for at least a year can change your whole perspective! And once trying some games you will be impressed by how much they are good!
I started with YouTube with random games like Trover Save The Univers, The Forest, Dying Light... and then I made Indie Games on this website my passion for the simple reason they are fun to play. Had a lot of devs join to the channel, got chances to work with some awesome projects! I have seen incredible Visual Novels which was something I hated about a year ago! Now, I am loving it. (The first post of Krunchy Fried Games is one of the dev who makes great VN Games)
Do not forget, some of the most famous Indie Games out there started here, example? = Among Us, Friday Night Funkin'
The games you see here are for free, and horror games on this website is the feed of big YouTubers like Markiplier for his 3 Scary Games series! You can for sure see some bad games, and that is because these developers are still learning on THEIR OWN to make games.
Now, if you still don't see good games on Itch.io that is fine! But I am sure you have not played even 1% of the games here and that is so far away to judge anything or anyone based on less than 1% of what they have to offer. Don't trust my words, see by yourself: