I think it's a good future for free accounts but idk why paid users should treat like this? if i registers my email account to forums and have some purchases on the same account it should automatically removed me from non-paid accounts because paid accounts don't share spam that often.
because i feels this rule farce me to do xx amount of passive comments just to get the privilege , it's the same to stackflow most people spam "grammar and typo" fix to farm their points.
Once you have made four posts and waited three days you should be able to change your avatar:
https://forum.affinity.serif.com/index.php?/topic/109729-how-to-change-profile-picture-on-affinity-forum/&do=findComment&comment=1158620