That's because not everyone can access alt-text. And those who can't can never read the extra stuff you've put into your alt-text. It's lost to them.
If you need more than 500 characters, you should instead
- move to a Mastodon server with a higher character limit
- move to Misskey
3,000 characters (hard-coded)
fully federated with Mastodon - move to a Misskey fork like Sharkey
thousands of characters (configurable by admin without hacking into the source code)
fully federated with Mastodon - move to Pleroma or Akkoma
5,000 characters (configurable by admin without hacking into the source code)
fully federated with Mastodon - move to Friendica
16,777,215 characters (database field size)
fully federated with Mastodon - move to Hubzilla
16,777,215 characters (database field size)
optionally fully federated with Mastodon - move to (streams) or Forte
> 24,000,000 characters (database field size)
fully federated with Mastodon
CC: @Jayne
#Long #LongPost #CWLong #CWLongPost #FediMeta #FediverseMeta #CWFediMeta #CWFediverseMeta #Fediverse #Mastodon #Misskey #Forkey #Forkeys #Sharkey #Pleroma #Akkoma #Friendica #Hubzilla #Streams #(streams) #Forte #AltText #AltTextMeta #CWAltTextMeta #A11y #Accessibility