Earlier quoted context omitted.
Sounds as if the current Cold War II situation keeps on escalating, people from a growing number of countries straight up won't be able to get visas for those conferences anymore.
Maybe fewer people being able to attend in person will force more conferences to take accessibility seriously. WWDC seems to have taken this to heart, for example.
It's not really a replacement for attending a conference live but it's a mostly inexpensive (money and time) way to get exposed to a lot of the formal content of a conference.