If we needed other proof that Dungeons & Dragons 5e was the "bully on the block", dwarfing all other RPGs, the 4th quarter report for the Fantasy Grounds Virtual Table Top shows the stark reality. 5e comes in with an ungodly 71% of 4th quarter game sessions on the platform.
Paizo comes in at 15% IF you combine Pathfinder 1e, Pathfinder 2e, and StarFinder as a single figure.
The following graph shows the influence of the pandemic on virtual play, at least using Fantasy Grounds (I'll be discussing 5e specifically below ):
Holding steady at around 20k sessions a month through February 2020, 5e spiked to over 80k sessions by April, and even the summer dip didn't go below 45k-ish. As for January 2021, it's knocking on 100k - nearly a five-fold increase.
These are just the numbers from Fantasy Grounds. Roll20's last ORR (3rd quarter 2020) report is less revealing, as we don't get to see the increase, if any, in sessions played (although 5e has a 53% share of the games and Paizo's share is even smaller than on FG). There is one tidbit of interesting information on the latest ORR report, and I'll share that below: