Kroko

YouTube has been profitable since 2019

There are browser extensions that automatically switch from YouTube to an alternative platform if video is available on both.

Watch on Odysee Firefox LINK

PeerTube Companion
Firefox LINK

It is difficult to switch to custom roms when manufacturers like Samsung block bootloader unlocking or like Xiaomi make the process hard.

https://github.com/melontini/bootloader-unlock-wall-of-shame

You should buy SoC only made by TCMS. It even more important whether It is a Snapdragon or a MediaTek.
Right now, the most important specification is battery capacity. Some Smartphones are already available with batteries up to 7000 mAh.

https://www.kimovil.com/en/where-to-buy-poco-f7
https://www.kimovil.com/en/where-to-buy-realme-gt7-12gb-512gb

https://nanoreview.net/en/soc-compare/qualcomm-snapdragon-888-plus-vs-qualcomm-snapdragon-6-gen-3

It is bad. It looks like less powerful that 888+ :L It even made by Samsung... which means it uses a worse manufacturing process than TSMC

If you want to run Android apps on Linux try Waydroid. It is probably one of the best option right now.

Samsung is a joke company. They block oem unlock from One ui 8. Samsung IMS isn't working in custom roms (AOSP) because they have some close implementation of IMS.
You should look to other company for next phone.

Can't you get WhatsApp to work in Waydroid?

List of linux phones OS: https://linmob.net/resources/#smartphones Sailfish os suported devices https://docs.sailfishos.org/Support/Supported_Devices/

They did have name mapy.cz

There aren't many good options for Linux phone... https://linmob.net/resources/#smartphones

I need to wait. Custom roms development for my new phone has only just started. Right now, there are only beta releases of LineageOS (unofficial). It doesn’t look that bad even though it has a MediaTek SoC.