You might want to find out if SACOFA is going to provide additional ports in your area.

This port insufficient issue has always been TM's dirty trick to prevent other ISPs from using their wholesale agreement which competes directly with their retail Unifi brand.

They will put you down or place it on low priority to upgrade their number of ports if they find out that your area is highly popular with their other competing ISPs and not theirs.

No point building a network for other ISPs to enjoy riding on them right? Who would?

Would you pave a road to a shared house with you as one of the tenants when you're not the heaviest user of it?
Pay from your own for others to enjoy?

Not sure if they run their own ISP, but they build the fibre networks themselves(not maintained by TM) and leased them to interested ISPs to use them instead. That way they don't need to wait for TM to expand their HSBB network.