Anyone can google and see lots of examples. Who knows how many people total have been affected, but definitely a large number. Here's some others in addition to the couple that were just posted:
The prime minister of Senegal says the country's women's basketball team has canceled plans to train in the U.S. after visa applications of five players and seven officials were not approved.
www.espn.com
Brazil’s Hugo Calderano, the 2025 World Cup champion, will miss this month’s WTT US Smash in Las Vegas after a visa issue linked to a past trip to Cuba
www.theguardian.com
There are many sports that never get primetime coverage, and gaming competitions, inherently all of those events could be deemed as not being "major". Since of course money and publicity are all that matter to society, not the human work/achievement of a particular thing.