Does the rejection by tech giants make you less confident in BTC's potential?
No, but I also feel like these tech giants are the antithesis of BTC anyway.
If you were the owner of Meta or Amazon, would you easily agree to accumulate more BTC?
Maybe privately; but I think these companies are more in the business of generating cashflow than holding assets, so no.
When do you think these tech giants will start accumulating BTC?
I'm going with a controversial "never", unless it becomes necessary to hold BTC as a hedge against currency fluctuations. But the reason I'd say "never" is because (afaik) they don't hold gold either so I doubt that they'll start accumulating BTC, unless shareholder sentiment shifts in a significant way.