Well I'm also a paying customer and I'm really glad they're doing this — this way I don't have to awkwardly piece together a VPN, a password manager, a mail client, a notes app, and a Google Docs alternative all from different places, probably paying separate subscriptions to each since I wouldn't trust free services. Instead I get a reasonably good suite of apps for everything privacy-related I need, all for $10/mo. The more they add, the more that money feels worth it and the more affirmed in my choice to pay it I feel.
I agree, everytime I think of migrating away from Proton, there's nothing that can replace the stack for the same price.
Maik + aliases alone are 6.5$, that's without including cloud storage or a vpn, you just can't beat it at that price.