I think the error is quite verbose and tells you everything you need to know.

Generally, do not install packages outside of a virtual environment unless you know what you’re doing. Given the option, use your package manager version of the same package. Outside of that, use your python environment manager of choice to install stuff. There are lots of options: conda, uv, venv, virtualenv, pipenv, etc.

The error exists to warn you that you could potentially break critical system installed packages by installing other things at a user or system level with pip.

Every time this happens to me, the clerk/cashier just shrugs and is like, “okay”. They get it, but are obligated to try anyway. The best you can do is be polite.

You might consider trying Miniconda, a version of Anaconda. It installs a local python environment of your choosing at a user level. https://docs.anaconda.com/miniconda/

I don’t know how safe this is, but what I do:

0. Make a local XMR wallet, backup, and host your own blockchain
1. Buy regular crypto, say LTC, from a legit exchange with KYC
2. Swap that to XMR on an anon swap/exchange, storing in your wallet 3 (optional). Move from your first wallet to another, for extra safety???

Spend it where you can, not many places. BTCPay server, which can be self-hosted, supports it, so there are options.