I'm not so sure. The front line in Ukraine seems to be pretty good at stopping people with access to military technology. I don't think an untrained and uncoordinated mass of civilians could do a better job, especially against future tech that's more sophisticated and available in larger quantities.
As military tech gets more and more inhuman, the power of masses of bodies is likely to decrease, and there will be even fewer opportunities for moral qualms to give civilians a chance.
https://en.wikipedia.org/wiki/2013_Metcalf_sniper_attack
Some dude in France just carried an attack with a ww2 sten gun, there are hundreds if not thousands of AK47s, grenades, etc. available on the black market. You can buy drone ready fiber optics cans on aliexpress, thermal/night vision cameras, etc.
Military tech is good but you still need people to follow orders, I very much doubt they'd side with the sociopath tech execs, nor their governments.
Data centers might be easier but
a) Will have a lot of security. It's much easier for somebody with money and connections (and now even intelligence+knowledge) to assembly a defense force than it's for a ordinary people to learn how to make proper molotovs, let alone learn how to shoot. And they will know when it's coming because even today's LLMs are good enough to surveil the entire internet.
b) I don't think they burn that well. When Ukraine strikes oil depots or warehouses, you can easily find images of them burning. I haven't looked particularly hard but images of droned data centers burning are quite a bit rarer. (I haven't seen a single one before actively searching, they do burn, but that's with military grade explosives.)