I use non-algorithmic RSS feeds nowadays. Used to use Feedly, I’ve since switched to Read You on Android.

Well, if it was ages ago, instances may have gotten wise to the fact that your account is gone and deleted the posts by now.

You post and comment histories would likely still be saved on any instances that federated with them previously, I would imagine.

Yep!

Because Android is technically open source and the hardware is free enough that I can install an alternative OS if I want to.

Also, the phones are cheaper and have headphone jacks!