Yesim offers several unlimited data eSIM options for France. The plans are available for 1 day at $8.14 USD, 7 days at $27.92 USD, 15 days at $40.72 USD, and 30 days at $50.03 USD. All plans work on 3G, 5G, and LTE networks and allow tethering.
Because the data is unlimited, speeds may be throttled after significant usage as part of a Fair Usage Policy. The normal speed is typically capped to a certain rate and the plan will maintain that speed until a threshold is reached, after which the rate may be reduced. If you want to understand exactly how much data is available at normal speed and whether a speed reduction would affect you, contact Yesim directly to confirm the details of their FUP.