The expiration date is increased at every login into your account (DevilWEB panel and SSH/SFTP count; FTP/FTPS don't because FTP accounts are virtual, created by the user).
Right now this mechanism is not active on serv00's servers, accounts are not blocked.
We will inform you when we start blocking inactive users but maybe there will be another rule than 90 days inactive.
For now we have plenty of space for new users and any time we can add new servers.
Do not overapply submissions, as per the link quoted in the response above your answer: 'The expiration date is increased at every login into your account (DevilWEB panel and SSH/SFTP count; FTP/FTPS don't because FTP accounts are virtual, created by the user).'"