Such things do work. But you will probably need to get new switches after each storm. Or at least change to another working ethernet port, because the used one will be knocked out by lightning, no matter how many precautions you will take.
In the long run, fiber is cheaper.
Torturing CCR1009-7G-1C-1S+, RB450G, RB750GL, RB951G-2HnD, RB960PGS, RB260GSP, OmniTIK 5HnD and NetMetal 922UAGS-5HPacD + R11e-5HnD in my home network.