While I absolutely hate when companies hikes up prices, "how do you know they won’t do it again next year?" isn't really a good argument. Any company can and will rise their prices whenever they want.
You can not know if Migadu will increase their prices again, just like you can not know if Scaleway will raise again (they raised 3 times in less than two years); but you can also not known that MXroute will not rise theirs prices too.