Is it though? It genuinely looks like you might get caught doing this, and I'm sure you are at least breaking airline policy, even if you're not charging money; not to mention if you charge.
The throttling is "per device", not "per type of device". If you connect 1 travel router and use it to share internet with >1 user, those users are sharing the capped capacity the plane gives to "one connected device".
https://www.techradar.com/pro/security/man-arrested-for-sett...