Look, let's be real, this is how I see this stuff after seeing it grow and grow for years online: probably 95% of these "can I sing" clips are either trolling and/or click harvesting. They get off on views. It's weird, I don't understand it, but likes, views, and clicks are the currency these days.
Then there's about 4% that can actually sing pretty decently and they know it, and they just want your admiration and applause. These people are also generally in the click-seeker camp. They usually do not come back to respond or thank anyone for the heaps of praise piled onto their ego.
The last 1% are the people that can marginally sing, really want to sing, maybe just have some confidence issues, and genuinely want genuine feedback and support. And that's cool. No problem.
But to me, in my mind, 1% is not a big enough piece of the pie for me to give a shit when 99% of these jokers are just wasting my time.
IMO, if you have to ask random nobodies on the internet if you can sing, you have some kind of psychological needy issue that goes beyond internet help. If you're so tone deaf that you cannot hear your own pitchiness, lack of melody, and poor timing, then internet people cannot help you. Just my opinion. No offense to those of you that get off on making can I sing videos and/or responding to them.