LoveSausage

With your own key? Nope

Also you have droidify and neostore that also do unattended background updates.

Signal with fake number. https://sms-man.com/?ref=qPLi0ekHzn_c is a good option , yea I added the referral link, remove last part if you wish. Or use a spare number , or wait until usernames are available , or matrix nexttalk and so on as already mentioned

Well sms-man works fine

You don't need a sim to get a verification code. Here is a service I use https://sms-man.com/?ref=qPLi0ekHzn_c but plenty of free ones if you got the time to test 20 non working numbers to find one that works. Just Google temporary SMS or recieve SMS online

Then get a fake number

Well a few ways . Create it on a pixelphone running GOS thru the sandboxed playstore . I also believe it works on any phone running below android 5.

Get a fake number. Plenty of options on Google I use a paid service using Monero. Worth it , cost like 3 euro for a few hours, or a few cents for a one-time SMS.

Use a public net /local coffee shop. Or one of the options above. Also No issue running stealth mode VPN ..

Lol. I can get a fake phone number or create a Gmail without any phone number blind drunk.

Same recommendation as usual from me :) pepparmint OS , Debian base extra on top

I sell some info by using a cashback app. Since my purchase habits are swooped up anyhow