You can follow any Mastodon account via RSS by just adding ".rss" to the end of the account's public profile URL.
To find a user's public profile URL, click on their profile image within Mastodon.
For example, if you click on FediTips' profile image you get this page in a new tab:
So, to follow FediTips through RSS, use this address:
This will only show that account's public posts. Other posts will not be visible on the RSS feed.
#RSS #MastoTips #FediTips #Mastodon
Yeah, I thought maybe mastodon treats hashtags similar to users since you can follow hashtags.