Some subs are a mystery what they accept or not, sometimes get message "deleted as of Reddit filters" after following all sub rules and using all UIs whie others can share there.
Some give comment "deleted as ecency or hive.blog or peakd.com are not trusted sources" but others can share.
Really time consuming to read and act according to any sub rules - but in the end it is fun and exciting to wait "are we accepted or not lol" :-)