They all had big ass signs in the front window saying $25/month per line (with a bunch of fine print that can't be read from outside the store).

Of course, none of them will honor that pricing. Also, none of them actually publish their prices. The best I got was some hand written scrawl from the the customer service person, who had memorized their pricing table.

Of course, after handing the piece of paper to me, he said something like, "so that'll be $85 per line, but in practice your bill will probably be $110. I've seen some people end up with $115/month".

Anyway, that's a long way of saying they can offer to pay me to subscribe to their crappy whatever service, and I'll still refuse.

You see "9,99€ / month" for a mobile plan? That's the full price they will take from you each month, no more. Only exception being the home fiber lines, which start at 24,99€/month but progressively increase every couple months to reach upwards of 30€/month.

I haven't seen that but I have had marketing phones where they insistently tried to upsell me on random shit ("security protection") or to increase bandwidth (I had 300Mbit/s, they wanted to sell me 600Mbit/s)

I (Sweden) haven't seen this before, where has this been used?

And 10Gbit FTTH from the same provider is just 12 euros. :)