Can also recommend Qwant besides Ecosia.

For AI chatbots I'd recommend Ollama, Kobold.cpp or Llamafix.

for mail, Mailbox and Tuta are great too.

For delivery services, Bol.com is better indeed (has better labour rights too), but ideal is to just go shopping in the city itself. It benefits local smaller stores too!

For YouTube, I'd recommend PeerTube.

For OS, it depends on how well you know Linux types. If you're new to Linux, and just want something that works, Linux Mint.

In general, the best bet would be as decentralised, open source, and horizontally organised as possible. Defederate from large companies. The less chance then, that a bad agent will be able to embrace, extend, and extinguish.