This site/instance is intended for use by myself, interested friends, and my family. If I don't know you on "real life" - you might want to look at Mastodon Communities to find an instance that fits you.
This mastodon instance is probably never going to be totally open for registrations from the general public. Feel free to apply though.
The site should remain fairly stable and fast. It's running on a linode with fairly low load and usage. All media, images and the like are stored in Amazon S3 buckets, and served up via CloudFront. Backups of posts are archived and stored offsite daily. Media posted here is auto-purged after 1 year.