Why? When they want to keep on working for all clients, they have to be able to filter out potential abuse.
I mean in this mail nostr:nprofile1qyg8wumn8ghj7mn09eehgu3wvdez7qgkwaehxw309ajkgetw9ehx7um5wghxcctwvshszxthwden5te0wfjkccte9ekk7mt0wd68ytnsd9hxktcpzemhxue69uhkummnw3ex2mrfw3jhxtn0wfnj7qgkwaehxw309aex2mrp0yhx6mmnw3ezuur4vghszxnhwden5te0wpuhyctdd9jzuenfv96x5ctx9e3k7mf0qy8hwumn8ghj7mn2w4khqtndv5hsqg9gplz20p35acn2409vj5d5eltm26hp3w4ax0z6lh8khmtdeq8t6ynyzrf2 gets the opportunity, to tell why he needs this exessive use. I mean when they would not do it, they would allow DDoS attacks via their VPN, which would eventually lead to legal consequences for Proton.