There are secure alternatives for almost all #BigTech apps that don't sell users' data.
For #whatsapp, there's @signalapp or @threemaapp.
For #Twitter, there is @Mastodon.
But for #snapchat, there has been no real alternative so far. So I did it myself and started #twonly. A European, #opensource alternative where all messages are encrypted end-to-end.
You can download #twonly via the following link.