As you might suspect, the data rate impacts the required RF bandwidth. Besides the data rate, the modulation method, encoding, packet overhead, duplexing, and other factors ultimately determine the required RF bandwidth. As an example, the 4G network has a data speed of ~20 Mbps and consumes a bandwidth from to 5 to 20 MHz.
In the United States, the 70 cm allocation extends from 420 MHz to 450 MHz in ITU region 2 for a total of 30 MHz of bandwidth. For US regions in ITU 1 or 3, this drops to 430 MHz to 440 MHz. In the US, hams on this band may not cause interference to radiolocation services (e.g. PAVE PAWS) that overlap this allocation. This would suggest that the technique would require a guard receiver and be adaptive to lock out bandwidth segments. The 420-430 MHz segment is also allocated on a primary basis to other services and not even available to hams north of "Line A". But the most significant limitation for data in this band is spelled out in 97.307(f)6:
A RTTY, data or multiplexed emission using a specified digital code listed in §97.309(a) of this part may be transmitted. The symbol rate must not exceed 56 kilobauds. A RTTY, data or multiplexed emission using an unspecified digital code under the limitations listed in §97.309(b) of this part also may be transmitted. The authorized bandwidth is 100 kHz.
So, at least in the US, there is insufficient permitted data rate to support your request. Since the US is the largest ham radio market, manufacturers may not have a large enough remaining market to support the development of such equipment even if other regions of the world have sufficient bandwidth allocated to the ham community.
In the US, the the data rate and bandwidth limits are lifted beginning with the 33 cm band (902-928 MHz in ITU 2 only). This band is granted as a secondary allocation and hams must also accept interference from industrial, scientific, and medical (ISM) equipment.
In the 13 cm and 9 cm bands, US hams have been very successful re-purposing equipment designed for consumer WiFi applications to the frequencies allocated to hams in the US on a primary basis where more power and higher gain antennas are permitted. See Hamnet as an example.
Finally, consider that for hams in the US, the TCP/IP traffic cannot contain encrypted or obscured information. This includes all encryption uses of TLS such as HTTPS and WSS type protocols. There is a limited encryption exemption for space telecommand purposes.