Ethernet connection not WiFi. Haven't had any issues with other games that I play online over WiFi. I play some games on Xbox and Switch.
Anyway I figured there would be other games I would need either GeForce Now to play or a new computer since my current one was old. And a new computer on sale would be cheaper in the long run than paying for the subscription every month.
A new serious gaming PC costs 2500 / 3000 € (without monitor / TV) in Europe (I don't know in what country do you live).
2500 € (low tier cost) / 16,67 € month (GFN Ultimate Tier 6 month subscription) = 150 months = 12,5 years. In addition GFN hardware is always updated, you don't have energy consumption for high end PC, Cloud gaming games are increasing day after day.
Why do you say you save on the long run?