For me, it came from my RSP (Superloop). The offer I got was entirely free upgrade and 6 months of 100mbps at the same cost as my previous speed (50mbps on FTTC).
Not sure the incentive around speed upgrade was needed, but I couldn't see any reason not to take them up on the offer and I'm glad I did - not that I had any significant FTTC issues before, but the ability to have multiple active services on FTTP as well as higher attainable speeds and the lack of delay while the FTTC reverse power activates the NTD at the street which used to drive me crazy after a power outage have already improved the excellent experience I'd already had with FTTC which had been almost bulletproof for me (sans for my house's RCD tripping from time to time which is hardly their fault, but which led to a good 30 mins delay to bring the port back up every time).