Why would you ever even consider Starlink if you have fiber availability?

Because here despite the finer, they still dare to sell 50, 100mbit connexions, 1Gbit max. I would like to liberate myself from this local oligarchy.

that is very confusing still, can you elaborate?

Unlike is some other countries where I've lived, where fibre is basically sold as whatever the line will carry (5,8 GB for instance), here providers still work under the assumption 1 Gbit is the fastest they'll ever have to provide (for a significant sum) and have a highly segmented lineup with speeds sometimes down to less then 50mbit, just to make people pay exorbitantly more (we have the most expensive internet in all of Europe). Three parties control the entire market and it is making them good money.

Starlink could be a way out of this market, but alas is not yet (well, they're actually price competitive, if you exclude the cost of Dishy and the power consumption).