This forum has seen an uptick in users since the pfsense exodus and might see some more. Ubiquiti breach worse than they said: https://krebsonsecurity.com/2021/03/whistleblower-ubiquiti-breach-catastrophic/
I think it's a relatively gradual growth. We will have some numbers for March soon, but I wouldn't expect any radical outliers on install base either.
Cheers,
Franco