If you look at the graph for the address pool (https://www.ripe.net/manage-ips-and-asns/ipv4/ipv4-pool https://www.ripe.net/manage-ips-and-asns/ipv4/ipv4-pool)

If you look at the graph for the address pool (https://www.ripe.net/manage-ips-and-asns/ipv4/ipv4-pool https://www.ripe.net/manage-ips-and-asns/ipv4/ipv4-pool) you see that the number of available addresses rose starting from February 2020 and then was rather constant until decreasing again in August/September before running out now. To me the timing looks like it's Covid related, I guess many companies didn't want to change their addresses while the admins couldn't get physical access to the servers...