The question is always phrased as «how many can I», and it is answered by «how many can I afford to lose». Here is what happens on the other side.
What Telegram sees
The address is not the only signal, but it is the most durable one. Device fingerprints can be forged, numbers differ, timing can be staggered — the IP stays the same. If ten accounts work from it for a week, they stop being independent: they are one unit wearing ten faces.
From there the mechanics are simple: a complaint about one becomes a reason to look at its neighbours. See why Telegram bans accounts.
Why one-per-account is cheaper
A proxy costs noticeably less than an aged account. Saving on the proxy puts the more expensive asset at shared risk. Count the whole thing, not the proxy line — see what a fleet costs.
The arithmetic almost always lands the same way: one lost account eats several months of proxy savings.
When sharing is acceptable
Two or three accounts on a mobile proxy is normal practice: thousands of live subscribers already sit behind that address and three more do not stand out. On a datacentre IPv4 it does not work — there you are the only tenant, and everything from that address is yours.
The rule worth remembering
One account, one proxy, and the proxy country matches the number's country. The second half matters as much as the first — see proxy geo and numbers.
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Load still has to be spread across accounts — separately here.