There seems to be several complaints on Twitter recently regarding people being denied boarding / not getting seat. Obviously we are only getting one side of the story, but there are 2 notable stand outs:

1) A current WTA professional (top 150 in the world) posted a couple of days ago that she was not given a seat at check-in and that her bags were tagged with stand by. She said that she was on a paid ticket. It appears that she made the flight in the end

2) A Panamanian Youtuber with 2.5M subscribers (and hundreds of thousands / millions of followers on Instagram, Twitter, etc) said that she was denied boarding today due to her flight being oversold. She claimed to have arrived on time for the flight. Seems that she was put on a flight 4 hours later

There are quite a few others complaining about the same thing too, which could indicate that there is actually something going on here (enough where its probably not just a couple of people who missed check-in / boarding times and are complaining on Twitter)