@lakoja @ProgGrrl Correct. Hashtag search on instances only shows you posts that are known to the instance (because of follow, boost or URL search).
When you are on a smaller instance, you won't find many posts. Because of that I build #mastovue years ago. I use it regularly to search for posts known to mastodon.social
Compare https://mastovue.glitch.me/#/mastodon.social/federated/search to https://mastovue.glitch.me/#/vis.social/federated/search