You can link to accounts like this:

wasteof.money/example

which redirects to:

wasteof.money/users/example

For more recent clients which were closed to the public, for example beta.wasteof.money, there was no join page because only verified beta testers could use wasteof3. This is also the case for wasteof4.

Basically, people clicked the join button on said clients and were redirected here instead of a join page.