To comply with GDPR we will not store any personally identifiable information from you. Therefore we will serve sub-optimal experience where some features such as Login/Signup are disabled. However, you will be able to search and see all the properties, see agent contact details and contact them offline on your own.
To sell your HDB prior MOP, you have to write into HDB for approval, based on normal cases. If it's a divorce case and your MOP is still far away, HDB will buy over your unit at valuation. As for penalty, there none but you would be considered as having enjoyed subsidized unit once.