Thank you so much for your comment! You are right, I fixed this moment

Is it better to delete the cafes/bars with the private access?

Thanks for explanation!

I saw the comment from the another user regarding this cafe. I've deleted it as I haven't find any 'fresh' information on this cafe. I will not do such actions in the future, I swear:) This cafe is on the map now.

I've decided to delete all links to both Google Maps and Facebook. I'll add the source of the opening hours and in these cases I'll set it to 'survey'. As I mentioned, I'll visit these places and verify information.

Morning. Honestly it's a good question, I thought about it. I've added the websites as a source of information. If there is no website, then based on the social media (Facebook and Instagram). And if there is nothing, then yes, Google Maps.
1. Google Maps: I've checked, it seems, you are right, I'll try to find another source and delete the link to Google Maps. It's easy to identify all such changes.
2. Facebook: I read a couple of discussions on this issue like this https://community.openstreetmap.org/t/use-facebook-instagram-business-page-account-in-addition-to-add-a-poi/106036/2. I haven't found any clear answer. However, I believe that it's okay to treat official accounts of the businesses in Instagram and Facebook, as their website. If you saw any other information, please point me out.
Thank you for your comment, it's really helpful! I'd like to add the initial data based on the online sources and then visit these places to verify information.

Good morning! If you can revert these deletions it would be great. As far as I know, most of them are vacant, but not all.

makes sense, thank you
btw it appears to be a correct link https://www.flickr.com/photos/131286969@N05/53607602819