As the title says, how often do you let someone know that you're not feeling the connection versus just unmatching or just not responding.
I'm not going to make this a gender thing because men and women ghost each other, put forth little effort, make the other carry the conversation, etc. all the time.
Personally, I let the person I'm talking to know every time – especially if we have had a date. I pretty much copy and paste this:
I enjoyed our time last night, but I'm not feeling a romantic connection. I sincerely wish you the best of luck finding someone right for you ❤️
This always goes well for me, and the women usually thank me for actually saying something compared to other men. The last woman I did this with said she was thinking the same thing but didn't know how to bring it up and was happy I did it for us. I wish more of the date market was just more courteous to help us be less bitter.