Personally, they would cause me very little concern. Have a look at how tyres are made..
www.youtube.com/watch?v=0Kk1MwVYVAc&ab_channel...9
There is very little possibility of them bursting as they run at less than half the pressure of my ancient cracked bicycle tyres. But if the rubber has become hard with age they will not grip so well, especially in the wet.
Dunno. If a tyre starts to bulge (as two of mine did, centred on cracks quite like those in the pictures) then I'm unclear what is going to stop it.
I'd have thought that was prima facie evidence it was structurally compromised.
When the first of my Bridgestones went lumpy, I put the spare, (a younger Chen shin light truck tyre with more plies and no cracks) on to replace it. A few days later I had to cross some overgrown waste ground which turned out to have the fallen remains of a chain link fence hidden in the undergrowth, which took a bit of crossing. Couldn't see any tyre damage but it was pretty dark.
Unwisely taking the expressway home, en route that tyre shed its tread, making an awful racket wire brushing my rear wheel well. Maybe the extra plies kept it together long enough to get to the tyre fitter the next day, after trimming some of the wires off.
I initially only got two replacements but when another Bridgestone got lumpy about a month later I got another three.
Tyres do fail, after all, and Bridgestones in particular famously have.
OTOH, full disclosure requires me to admit that 2-3 years previously I "experimented" with sunflower oil as a tyre treatment, and this could have softened the compound.
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