Tl;dr: it’s fediverse Disqus 👍 Nice to have!

Email blocklists are based on spam and malware.

I’ve never heard of an email operator refusing to send or deliver SMTP messages to/from a certain provider because too many of its users support the wrong political party.

You don’t need insync - most people just automate rclone sync commands using whatever task scheduler their system runs by default (cronjobs or systemd units, typically). For those who prefer a GUI, KDE has a Scheduled Tasks app.

On Android, you can use Round Sync which is a wrapper around rclone and can import the same configs.