The way I understood is that there was a donation platform (similar to GoFundMe) and the donations were sent there so you can't really say the "truckers received bitcoin" because they didn't.
Besides the Canadian government didn't "ban" addresses, they banned "bank accounts" of those who sold bitcoin for fiat and the authoritarian government thought were linked to the protests.
'tallycoin' didnt manage a privkey. they are just a website where people type in a public address. a target to achieve. and a title for the campaign.
tallycoin just block 'explores' the public address and tally's the total transactions put into the address as a display on the website. without actually having to know the privkey.
the fundraisers (actual privkey owners) had the keys to ~20.6 btc upto valentines day. and they moved the coin to ~3dozen other keys presumed to now be owned by 'unknown people in a group of multisigs'
where these new 'unknown people' have the keys to move the coins split over 3dozen addresses.
..
as for the government.. much like publicising a FBI 'most wanted' watch list of terrorist suspects. the government also now has a bitcoin address suspect watch list. which all exchanges that are (regulated) money service businesses have to not only KYC their customers but also.. to watch any donations coming into those exchanges and if its one of these "watchlist" suspect taints, report details of what account is associated with such suspect deposit.
its then up to the report to describe events, also note value deposited, value already in account, trade history, ip, email and ofcourse the KYC ID. and send this report to the government. there is no government, not even in china, that spies on every account(they dont have the ability nor manpower to do so). they rely on regulated businesses reporting SUSPECT customers or be punished if found to have failed to report on something that should have been reported. not every account is sent to government. just suspect accounts
its then upto the government to read the suspect report and to decide what actions need to be taken. such as to order the exchange:
to freeze the account completely
not offer any service to the account user apart from withdrawal of same format currency via same method as deposit
restrict some services/features of the exchange
allow transactions/trade/exchange/withdrawal by other means to continue.