At my previous business we wanted to use nginx plus, so we asked them for a quote saying we had between 10 and 50 servers running nginx per day (autoscaled depending on load)
We got back a short email saying it's $2500 per server, so $125000/year.
Considering our total hosting costs at this point were around $30-40k, that is absolutely absurd.
That is stretch of a statement - maybe you are not entirely incorrect. But the onus is on both sides. I'm also at that stage where I can migrate to traefik or caddy relatively easily... but I dont mind paying 100$ to nginx for something familiar and an almost negligible incremental cost to them.
I am not claiming a magic bullet, but there's a reason why SAAS companies with easy switchability have a gradually increasing payment plan. Instead of heartburn inducing 0-10K USD.
And if you're operating at the scale where this doesn't make sense, and you still can't afford $10k/year, then maybe you need VC money? ;-)